JP6090202B2 - Safety device when working on the elevator car - Google Patents

Description

  The present invention relates to a safety device for work on an elevator car that can ensure the safety of a worker on the car when the car and the counterweight are rubbed against each other.

  2. Description of the Related Art Conventionally, various measures have been taken in order to prevent workers on a car from coming into contact with the counterweight when the counterweight and the counterweight of the machine room-less elevator work on each other. For example, a counterweight warning label is affixed to a counterweight guide rail, and a worker on the car works while visually checking the counterweight warning label. However, if it depends on the visual sense of the worker on the car, it may be missed.

  Further, as a prior art, a safety device for driving on an elevator car that stops the car when a detection means that detects that the body of the worker on the car has protruded from the hoistway side from a predetermined range of the upper part of the car is activated. Is known (see, for example, Patent Document 1). As another conventional technique, a detection plate that can be displaced or moved in the vertical direction by contact with an obstacle is provided at the lower end of the counterweight, and a sensor that detects the displacement (movement) of the detection plate is provided. An elevator is known in which an elevator is stopped or decelerated before an object contacts a counterweight (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 6-286952 JP-A-11-33018

  In the case of the one described in Patent Document 1, since the car is stopped after it is detected that the worker on the car has protruded, if the reaction is delayed or is about to protrude, the contact will not be made in time. It is feared to do. In addition, since the car described in Patent Document 2 is stopped on the premise that the detection plate provided at the lower end of the counterweight is in contact with the obstacle, the car can be stopped before the car contacts the counterweight. However, it is conceivable that the worker on the car comes into contact with the lower end of the counterweight immediately before the car stops.

  The present invention has been made to solve the above-described problems, and a switch provided on a safety handrail on an assembly-type car steps on a counterweight approach detection cam provided at a predetermined position of a counterweight guide rail. And a safety device for working on an elevator car that sounds an alarm.

In the safety device at the time of work on the elevator car according to the present invention, the car is lifted and lowered in the hoistway, the counterweight is lifted in the hoistway in the opposite direction, and the counterweight is erected in the hoistway. A counterweight guide rail for guiding the lifting and lowering of the car, and an assembled safety rail on the cage that is folded up during normal operation and assembled when working on the cage, and a safety rail on the cage, When the safety handrail on the car is folded, normal operation is possible and operation on the car is impossible, and when the safety handrail on the car is assembled, normal operation is not possible and operation on the car during inspection work is possible. The balance between the handrail assembly confirmation means and the safety handrail on the car is provided on the handrail on the weight side, and when the safety handrail on the car is folded, the switch opening / closing operation part is balanced. It does not protrude into, and cage safety switch when the car safety handrail is assembled to protrude weight side switch opening and closing operation portion are balanced, guide the counterweight near the midpoint of the hoistway which pass each other counterweight and cage At least one counterweight approaching detection cam provided on the rail so as to face the switch opening / closing operation part of the safety switch on the car, connected to the handrail assembly confirmation means and the safety switch on the car in series, and balanced with the car It is equipped with an alarm sound generation device that generates an alarm sound to the worker on the car when the weight approaches, and when the car is raised, the counterweight is moving closer to the rising car and the car is safe When the switch opening / closing operation part steps on at least one counterweight approach detection cam, the alarm sound generator sounds an alarm sound. It is intended.

Upper balance weight approach detection cams provided on the upper and lower parts of the balance weight guide rail near the middle point of the hoistway where the balance weight and the weight of the car balance each other. And a lower counterweight approaching detection cam, and when the car is in the ascending operation, the lowering counterweight approaches the rising car, and the switch opening / closing operation part of the upper car safety switch is connected to the lower counterweight approaching detection cam. When the is stepped on, the warning sound generator sounds an alarm sound, and after the rising car and the lowering balance weight rub against each other, the switch opening / closing operation part of the safety switch on the car moves the upper balance weight approach detection cam. When stepped on, the warning sound generator stops the warning sound. On the other hand, when the car is in the descent operation, the rising counterweight approaches the descent car. When the switch for opening / closing the safety switch on the car steps on the upper balance weight approaching detection cam, the alarm sound generator sounds an alarm sound, and the car that is descending and the counterweight that is rising are rubbed together and separated. When the switch opening / closing operation part of the upper safety switch steps on the lower balance weight approach detection cam, the alarm sound generating device stops the alarm sound.

Also, a counterweight warning label is affixed to at least one of the counterweight guide rails on the counterweight guide rail near the midpoint of the hoistway where the car and counterweight rub against each other, or at the same position as the upper and lower counterweight approach detection cams. It is.

Also, the counterweight approach detection cam provided on the counterweight guide rails in the vicinity of the midpoint of the hoistway which pass each other counterweight and cage, which was attached to the front side or back side of that affixed to the counterweight caution label is there.

  Further, a counterweight is disposed on the rear side of the car, and a car safety switch is provided on the handrail on the inner side of the car safety handrail.

  Also, the counterweight is arranged on either the left or right side or both sides of the car, and the car safety switch is provided on either the left or right handrail or the left or right handrail of the car safety handrail. is there.

  According to this invention, when the car and the counterweight rub against each other, if the switch provided on the safety rail on the assembled car steps on the counterweight approach detection cam provided at a predetermined position of the counterweight guide rail, an alarm sound is generated. Because it sounds, the safety of workers on the car can be ensured.

It is a longitudinal cross-sectional view of the hoistway which shows the safety device at the time of work on the elevator car in Example 1 of this invention. It is a principal part perspective view at the time of the automatic driving | operation which shows the state which folded the safety handrail on the cage | basket | car of the safety device at the time of the work on the elevator car in Example 1 of this invention. It is a principal part perspective view at the time of the check work which shows the state which assembled the safety handrail on the car of the safety device at the time of work on the elevator car in Example 1 of this invention. It is a principal part side view which shows the relationship between the cage of a safety device at the time of work on the elevator car in Example 1 of this invention, and a counterweight. It is an electric circuit diagram which shows the principal part structure of the safety device at the time of work on the elevator car in Example 1 of this invention.

Example 1.
1 is a longitudinal sectional view of a hoistway showing a safety device during work on an elevator car in Embodiment 1 of the present invention, FIG. 2 is a perspective view of a main part during automatic operation showing a state in which a safety handrail on the car is folded, FIG. 3 is a perspective view of the main part at the time of inspection work showing the assembled state of the safety handrail on the car, FIG. 4 is a side view of the main part showing the relationship between the safety device and the counterweight during the work on the elevator car, and FIG. It is an electric circuit diagram which shows the principal part structure of the safety device at the time of work on a cage | basket | car.

In the figure, 1 is a hoistway, 2 is an elevator car that moves up and down in the hoistway 1, 3 is a counterweight that moves up and down in the hoistway 1 in the opposite direction to the car 2, and is arranged behind the car 2. Indicates the case. 4 is a machine room-less elevator hoist installed in the upper part of the hoistway 1, 5 is a main rope wound around the hoist 4, and a car 2 and a counterweight 3 are connected to both ends to move up and down It is suspended in the road 1. 6 is an assembly-type car safety handrail installed on the upper part of the car 2 and is assembled for the purpose of ensuring the safety of workers during work on the car. The handrails 6a and 6b on the left and right sides, It is comprised from the handrail 6c. That is, the safety handrail 6 on the car is in a folded state as shown in FIG. 2 during normal fully automatic operation, but an operator gets on the car at the time of inspection work, as shown in FIG. After the left and right handrails 6a and 6b are erected, the rear (balanced weight side) handrail 6c is erected and fixed to the left and right handrails 6a and 6b with a thumbscrew or the like, Become. The car handrail safety handrail 6 is provided with a handrail assembly confirmation switch 7. When the car safety handrail 6 is folded (see FIG. 2), the handrail assembly confirmation switch 7 is turned off, and the normal handrail assembly confirmation switch 7 is turned off. Automatic operation is possible. When the on-car safety handrail 6 is assembled (see FIG. 3), the handrail assembly confirmation switch 7 is turned on, and the car can be operated during inspection work. Reference numeral 8 denotes a car-top safety switch provided on the handrail 6c on the back side (the counterweight side) of the car-top safety handrail 6 and has a switch opening / closing operation lever 8a protruding therefrom. The car safety switch 8 does not protrude to the counterweight 3 side during fully automatic operation when the car safety handrail 6 is folded, and is only for inspection work on the car on which the car safety handrail 6 is assembled. The switch opening / closing operation lever 8a is configured to protrude to the counterweight side. 9 is an alarm sound generating device such as a buzzer provided inside the safety switch 8 on the car. The alarm sound sounds when the switch is ON, and the alarm sound stops when the switch is OFF. The alarm sound generating device 9 may be provided anywhere as long as the worker on the car can hear it. Note that the handrail assembly confirmation switch 7, the car safety switch 8, and the alarm sound generator 9 are electrically connected in series as shown in FIG. Reference numeral 10 denotes a counterweight guide rail standing on the hoistway 1, and the counterweight 3 is guided to ascend and descend. Reference numerals 11a and 11b denote upper counterweight approaching cams and lower counterweight approaching detection cams mounted at two positions above and below the counterweight guide rail 10 near the middle point of the hoistway 1 where the counterweight 3 and the car 2 rub against each other. A cam is provided to inform that the lifting weight 3 is approaching the rising / lowering car 2 from above or below. Thereby, at the time of inspection work, the handrail assembly confirmation switch 7 is turned ON, and when the car 2 is in the ascending operation, the counterweight 3 that is descending approaches the car 2 that is ascending, and the switch of the above-mentioned car safety switch 8 is switched. When the opening / closing operation lever 8a steps on (climbs on) the lower balance counterweight detection cam 11b, the car safety switch 8 is turned on, and the alarm sound generator 9 sounds an alarm sound. Even if the body is on the side of the counterweight 3, a time margin is provided to allow sufficient evacuation. Moreover, since the alarm is sounding, it will not try to protrude from the body. Further, after the car 2 being raised and the counterweight 3 being lowered are separated from each other, the switch opening / closing operation lever 8a of the above-mentioned car safety switch 8 steps on (climbs on) the upper balance weight approaching detection cam 11a. The car safety switch 8 is turned OFF, and the alarm sound generator 9 stops the alarm sound. The alarm sound may be gradually increased as the counterweight 3 approaches the car 2 or may be at a maximum volume when the counterweight 3 and the car 2 are rubbed with each other. It should be noted that the upper balance weight approach detection cam 11a and the lower balance weight approach detection cam 11b are located at substantially the same two positions on the upper and lower sides of the balance weight guide rail 10 in the vicinity of the intermediate point of the hoistway 1 where the balance weight 3 and the car 2 rub against each other. Separately, a counterweight warning label (not shown) may be attached. The upper counterweight approach detection cam 11a and the lower counterweight approach detection cam 11b are attached to the counterweight guide rail 10 so as to be positioned on the near side or the rear side of the counterweight warning label (not shown). Also good.
Further, the most important point to be noted when working on the elevator car is a place where it is rubbed against the counterweight 3 that is descending during the ascending operation of the car 2. Therefore, at least one lower counterweight approaching proximity detection cam 11b may be attached to the counterweight guide rail 10 near the midpoint of the hoistway 1 where the counterweight 3 and the car 2 rub against each other.

Example 2.
In the first embodiment, the counterweight 3 is disposed on the rear side of the car 2, and the car safety switch 8 is provided on the handrail 6 c on the back side of the car safety handrail 6 (the counterweight side). In the case where the counterweight 3 is arranged on either the left or right side or both the left and right sides of the car 2, the car safety switch 8 is connected to the left and right handrails 6a of the car safety rail 6. 6b or left and right handrails 6a and 6b may be provided.

1 hoistway, 2 car, 3 counterweight, 4 hoisting machine, 5 main rope, 6 car safety handrail, 6a, 6b left and right handrails, 6c back handrail, 7 handrail assembly confirmation switch, 8 car safety switch, 8a switch closing operation lever, 9 warning sound generator (buzzer), 10 counterweight guide rails, 11a upper counterweight approach detection cam, 11b lower counterweight approach detection cam.

Claims (6)

Whether to go up and down in the hoistway,
A counterweight that lifts the car up and down in the opposite direction in the hoistway;
A counterweight guide rail that is erected in the hoistway and guides the lifting and lowering of the counterweight;
An assembled handrail on the car that is provided at the top of the car, folded during normal operation, and assembled during work on the car;
Provided on the safety rail on the car, the normal operation is enabled when the safety rail on the car is folded, and the normal operation is disabled when the safety rail is assembled. Handrail assembly confirmation means that enables operation on the car during inspection work,
Provided on the counterweight-side handrail of the car safety rail, and when the car safety rail is folded, the switch opening / closing operation part does not protrude to the counterweight side, and the car safety handrail is assembled. A safety switch on the car, when the switch opening / closing operation part protrudes to the counterweight side,
At least one counterweight approaching detection cam provided on the counterweight guide rail in the vicinity of the intermediate point of the hoistway where the counterweight and the counterweight rub against each other so as to face the switch opening / closing operation portion of the on-car safety switch. When,
An alarm sound generating device that is connected in series with the handrail assembly confirmation means and the car safety switch, and that generates an alarm sound for a worker on the car when the car and the counterweight approaches.
When the car is moving up, the descent counterweight approaches the ascending car and the switch opening / closing operation part of the on-car safety switch steps on the at least one counterweight adjacency detection cam, A safety device for work on an elevator car, characterized in that the alarm sound generator sounds an alarm sound. Whether to go up and down in the hoistway,
A counterweight that lifts the car up and down in the opposite direction in the hoistway;
A counterweight guide rail that is erected in the hoistway and guides the lifting and lowering of the counterweight;
An assembled handrail on the car that is provided at the top of the car, folded during normal operation, and assembled during work on the car;
Provided on the safety rail on the car, the normal operation is enabled when the safety rail on the car is folded, and the normal operation is disabled when the safety rail is assembled. Handrail assembly confirmation means that enables operation on the car during inspection work,
Provided on the counterweight-side handrail of the car safety rail, and when the car safety rail is folded, the switch opening / closing operation part does not protrude to the counterweight side, and the car safety handrail is assembled. A safety switch on the car, when the switch opening / closing operation part protrudes to the counterweight side,
The counterweight guide rails of the upper and lower switches for opening and closing operation of the car on the safety switch in two places and the upper counterweight sinker approach detection that is provided so as to face the vicinity of the midpoint of the hoistway the weight pass each other counterweight and said car A cam and a lower counterweight approaching detection cam;
An alarm sound generating device that is connected in series with the handrail assembly confirmation means and the car safety switch, and that generates an alarm sound for a worker on the car when the car and the counterweight approaches.
When raising the car, the counterweight that is being lowered approaches the car that is rising, and the switch opening / closing operation part of the safety switch on the car steps on the counterweight approaching detection cam of the lower counterweight, the alarm sound is generated. When the device emits an audible alarm and the rising car and the lowering weight are separated after rubbing, the switch opening / closing operation part of the safety switch on the car steps on the upper counterweight approaching detection cam. The sound generator stops the warning sound. On the other hand, when the car is descending, the lifting counterweight approaches the descending car, and the switch opening / closing operation part of the on-car safety switch approaches the upper counterweight When the detection cam is stepped on, the warning sound generator sounds a warning sound, and after the falling car and the rising counterweight are rubbed together, When the switch opening and closing operation of the switch steps on the lower counterweight approach detection cam safety device when the elevator car working, wherein the warning sound generator is to stop the alarm sound. The balance weight warning label is affixed to at least one of the balance weight guide rails near the midpoint of the hoistway where the balance weight of the car and the balance weight rub against each other, or the same position as the upper and lower balance weight approach detection cams. The safety device at the time of work on the elevator car according to claim 1 or 2. Counterweight approach detection cam provided on the counterweight guide rails in the vicinity of the midpoint of the hoistway which the counterweight and car pass each other includes, characterized in that attached to the front side or back side of that affixed to the counterweight caution label A safety device for working on an elevator car according to claim 3.   The elevator car according to any one of claims 1 to 4, wherein a counterweight is disposed on the rear side of the car, and a car-top safety switch is provided on a handrail on the back side of the car-top safety handrail. Safety device for top work.   The counterweight is arranged on either the left or right side or both the left and right sides of the car, and the car safety switch is provided on either the left or right handrail or the left or right handrail. The safety device at the time of work on the elevator car according to any one of claims 1 to 4.

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