JP2626408B2 - Emergency stop device for elevator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency stop device for an elevator.

[0002]

2. Description of the Related Art As a conventional emergency stop device for an elevator of this type, there is a technology disclosed in Japanese Utility Model Laid-Open No. 56-140570. 2 is a front view showing the entire conventional emergency stop device for an elevator, FIG. 3 is a front view of a main part of the conventional emergency stop device for an elevator, and FIG. 4 is a sectional view taken along the line AA in FIG.

In the figure, reference numeral 1 denotes an elevator shaft, 2
Is a machine room provided in the upper part of the hoistway 1, 3 is a hoist provided in the machine room 2, 4 is wound around the hoist 3, an elevator car 5 at one end, and a counterweight 6 at the other end. It is the main measure that hung. Reference numeral 7 denotes a car emergency stop mechanism provided below the elevator car 5, and reference numeral 8a denotes a car speed governor driven by a governor rope 9 engaged with the car emergency stop mechanism 7. 1
Reference numeral 0 denotes a counterweight emergency stop mechanism provided below the counterweight 6, and reference numeral 8b denotes a counterweight governor driven by a governor rope 12 that engages with the counterweight emergency stop mechanism 10. 11a is a tension pulley attached to the lower end of the suspension of the governor rope 9 to apply a constant tension to the governor rope 9,
11b is attached to the suspension lower end of the governor rope 12,
This is a tension wheel that applies a constant tension to the governor rope 12. 13 is a guide rail erected on the hoistway 1, and 14 is a guide shoe.

[0004] Reference numeral 15 denotes a pull-up lever, which is pivoted upward around the other end by a governor rope 9 engaged at one end.
Reference numeral 6 denotes a connecting rod connected to the pull-up lever 15, and reference numeral 17 denotes a malfunction preventing member comprising a biasing member such as a coil spring for biasing the connecting rod 16 toward the anti-speed governor rope 9 to prevent a malfunction of braking. Means 18 are operating levers which rotate coaxially and upward with the pulling lever 15. Numerals 19 are arranged on both sides of the guide rail 13, form a wedge shape with a slope on the side opposite to the guide rail 13, and
A brake element 20 that moves upward with the rotation of the elevator car 20 is a frame of the car emergency stop mechanism 7 attached to the lower part of the elevator car 5, 2.
Reference numeral 1 denotes a horseshoe-shaped spring held by the frame 20, reference numeral 22 denotes a clamping body which is fixed to the spring 21 on one side and faces the guide rail 13 at a predetermined distance, and reference numeral 23 denotes a plate. A plurality of rollers held as possible.

Next, the operation of the conventional elevator emergency stop device will be described. If the elevator car 5 and the counterweight 6 descend at an abnormal speed for some reason, the car governor 8a
Alternatively, the counterweight governor 8b raises the lifting lever 15 via the governor rope 9 or the governor rope 12.
When the lifting lever 15 is raised, the connecting rod 16 moves in the direction of the governor rope 9 against the elastic force of the urging body of the malfunction preventing means 17, and a pair of right and left attached to the lower part of the elevator car 5. Is raised. For this reason, the brake element 19 normally held at the lowered position is normally used.
Moves upward together with the roller 23 and intervenes between the guide rail 13 and the clamping body 22. Then, the clamping body 22 tries to displace in a direction away from the guide rail 13, whereby a reaction force is generated by the bias of the spring 21, and the brake element 19 is pressed against the guide rail 13. Then, a braking force is generated due to friction between the guide rail 13 and the braking element 19, and the elevator car 5 and the counterweight 6 are brought to an emergency stop.

By the way, when a normal elevator is started,
When the elevator car 5 or the counterweight 6 descends, the weights of the governor rope 9, the governor rope 12, the tensioner 11a, the tensioner 11b, the car governor 8a, the counterweight governor 8b, The pull-up lever 15 is pulled up by that much due to the inertia of the pulling wheels 11a and 11b, that is, the inertia force. For this reason, the car emergency stop mechanism 7 or the counterweight emergency stop mechanism 10 may malfunction. Therefore, the conventional emergency stop device for an elevator includes the malfunction preventing means 17 comprising an urging member such as a coil spring.
The connecting rod 16 is constantly urged toward the anti-speed governor rope 9 by its elastic force, and the lifting lever 15 is depressed, so that the elevator emergency stop mechanism 7 is activated when the elevator car 5 or the counterweight 6 starts to descend. Or, the counterweight emergency stop mechanism 10 is prevented from malfunctioning.

[0007]

Since the conventional elevator emergency stop device is constructed as described above, the urging force of the malfunction preventing means 17 when the emergency stop mechanism 7 operates at the time of an emergency stop. Act as a resistance to the upward movement of the brake 19, and thus an operation delay has occurred. Further, for some reason, during the operation of the car emergency stop mechanism 7 and the counterweight emergency stop mechanism 10, the pulling force of the governor rope 9 or the governor rope 12 decreases, and the lifting lever 15 is lifted. When the force decreases to near the malfunction prevention force, the upward movement of the brake 19 is suppressed by the urging force of the malfunction prevention means 17, and the braking force is insufficient, and in some cases, the braking force is lost, and the elevator car 5 and the counterweight 6 are removed. There is a problem that the predetermined braking cannot be performed.

Accordingly, an object of the present invention is to provide an emergency stop device for an elevator which can prevent malfunction in normal times, and can quickly and surely displace a brake to a predetermined position and stop an elevator in an emergency stop. It is assumed that.

[0009]

An emergency stop device for an elevator according to the present invention is provided at a lower portion of a lifting / lowering body, and when the pulling force of a governor rope exceeds a predetermined value, the braking device is displaced upward. An emergency stop mechanism for the child to be pressed by the guide rail to perform an emergency stop of the elevating body, one side is locked to the governor rope, the other side is pivotally supported, and rotates by the pulling force of the governor rope, A lifting member for displacing the brake element upward,
In an elevator emergency stop device provided with malfunction prevention means for restricting rotation of the lifting member in normal times and preventing malfunction of the emergency stop mechanism, the emergency stop device is provided at the other end of the lifting member. A cam provided on the malfunction preventing means and urged by an urging member to press the cam to generate a turning force on the pull-up member, wherein the turning force generated by the pressing element is provided. Occurs when the lifting member is in the normal position, in a direction to push down one side of the lifting member, and when the lifting member is near the emergency stop position, The cam is formed so as to be generated in the direction of pushing up the side.

[0010]

In the present invention, the biasing member of the malfunction preventing means suppresses the upward rotation of the cam surface of the pull-up member in a normal state where the pulling force of the governor rope is equal to or less than a predetermined value. Therefore, the brake of the emergency stop mechanism does not move upward due to erroneous operation and does not stop the elevator vertically. On the other hand, during an emergency stop in which the pulling force of the governor rope is equal to or greater than a predetermined value, the urging member of the malfunction preventing means is attached to the cam surface of the lifting member in a direction to promote the upward rotation. As a result, the operation delay due to the urging force of the malfunction prevention means at the time of descent start is reduced, and even if the pulling force of the governor rope is reduced to near the malfunction prevention force for some reason, the brake element is displaced upward. The emergency stop mechanism operates, and the elevating body stops without fail.

[0011]

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a front view of an essential part showing an emergency stop device for an elevator according to one embodiment of the present invention. In the drawings, the same reference numerals as those shown in FIGS. 2 to 4 denote the same or corresponding parts as those of the related art.

In the drawing, reference numeral 15 denotes a pull-up lever which is pivoted upward by a governor rope 9 which is engaged at the other end with the shaft side end as a shaft, and a cam is formed at the shaft side end. ing. The cam of the lifting lever 15 is divided into a lower arc portion and an upper arc portion at a point P on a substantially center line passing through the shaft. Reference numeral 24 denotes a malfunction preventing means provided at a position adjacent to the pull-up lever 15 in place of the conventional malfunction preventing means 17, and 25 denotes a pull-up lever 15 in the malfunction preventing means 24.
A curved surface seat formed on the contact surface with the cam, 26 is an eyebolt whose one end is rotatably attached to the rotating shaft of the pull-up lever 15, and 27 is a curved surface seat 25 on the speed governor rope 9 side. A biasing coil spring 28 is an eyebolt fixing bracket for holding the other end of the eyebolt 26. The same counterweight emergency stop mechanism 10, lifting lever 15, malfunction prevention means 24, and the like as those on the elevator car 5 side are also mounted on the counterweight 6 side.

Next, the operation of the elevator emergency stop device of the present embodiment configured as described above will be described. Normally, the malfunction preventing means 24 presses the lower arc portion of the cam of the lifting lever 15 via the curved surface seat 25 by the elastic force of the coil spring 27, and the speed control rope 9 of the lifting lever 15 is moved.
Is held so as to be at the lowered position. Thus, the operating lever 18 coaxial with the pulling lever 15 is also located below, and the upward movement of the brake 19 is restricted.
For this reason, the car emergency stop mechanism 7 does not operate, and a malfunction when the elevator car 5 and the counterweight 6 are lowered is prevented.

On the other hand, the elevator car 5 and the counterweight 6
When the pulling force of the governor rope 9 becomes a predetermined value or more and the pulling lever 15 is pulled up to a predetermined stroke or more, the point P of the cam of the pulling lever 15 moves to the curved seat 25. The urging force of the malfunction prevention means 24 that has pushed the pulling lever 15 downward beyond the contact point with the pulling lever 15 acts as a pulling force of the pulling lever 15,
As a result, the lifting lever 15 rotates to the position indicated by the two-dot chain line, and the brake 19 moves upward. This is because even if the pulling force of the governor rope 9 is reduced to a value close to the malfunction prevention force for some reason, if the pulling force is equal to or more than a predetermined value, the P point of the cam of the pull-up lever 15 is curved. 25, the lifting lever 15 is provided with the malfunction prevention means 24.
Is rotated upward by the urging force, and the elevator car 5 is reliably stopped as described above.

As described above, the emergency stop device for an elevator according to the above-described embodiment is disposed below the elevator car 5 and the counterweight 6 which are elevating bodies, and when the brake element 19 is displaced upward, the spring 21 is disengaged. A car emergency stop mechanism 7 and a counterweight emergency stop mechanism 10 that perform an emergency stop of the elevator car 5 and the counterweight 6 by being pressed by the guide rails 13 via the guide rail 13, a governor rope 9 and a governor rope 12 The lifting lever 15 as a pulling member that rotates upward by the pulling force of the brake lever and moves the brake element 19 upward, and the upward rotation of the pulling lever 15 in a normal state is regulated by an urging member. In an elevator emergency stop device provided with a malfunction prevention means 24 for preventing a malfunction of the car emergency stop mechanism 7 and the counterweight emergency stop mechanism 10, the shaft side of the lifting lever 15 A cam is formed in the portion, and a curved seat 25 is formed on a contact surface of the coil spring 27 of the malfunction preventing means 24 with the cam, so that the pulling force of the governor ropes 9 and 12 exceeds a predetermined value. Sometimes the car emergency stop mechanism 7
In addition, the brake 19 of the counterweight emergency stop mechanism 10 can be moved upward.

Therefore, according to the above embodiment, when the lifting lever 15 as the lifting member is in the normal position, the rotating force generated by the pressing element 19 is generated in the direction of pushing down one side of the lifting lever 15. In addition, when the pulling lever 15 is in the vicinity of the emergency stop position, the cam of the pulling lever 15 is formed so as to be generated in a direction to push up one side of the pulling lever 15, so that in normal times, Since the coil spring 27 of the malfunction preventing means 24 urges the cam surface of the pull-up lever 15 in a direction for suppressing the upward rotation,
It is possible to prevent a malfunction in which the brake element 19 of the car emergency stop mechanism 7 and the counterweight emergency stop mechanism 10 moves upward.

On the other hand, at the time of an emergency stop, the coil spring 27 of the malfunction preventing means 24 urges the cam surface of the pull-up lever 15 in a direction to promote the upward rotation. An operation delay due to the urging force of the means 24 can be reduced. Further, even if the pulling force of the governor ropes 9 and 12 decreases to a value close to the malfunction preventing force for some reason, the car emergency stop mechanism 7 and the counterweight emergency stop mechanism 10 are operated to operate the elevator car 5. In addition, the counterweight 6 can be reliably stopped.
Further, since the curved surface seat 25 of the malfunction preventing means 24 is formed in a curved surface, the cam surface of the pulling lever 15 which is in contact therewith rolls on the curved surface seat 25, and the pulling lever 15 smoothly moves. Rotate. For this reason, it is possible to further reduce the operation delay due to the urging force of the conventional malfunction prevention means 17 at the time of start of descent.

The point P at which the cam of the pulling lever 15 in the above embodiment is divided into a lower circular arc portion and an upper circular arc portion is provided substantially on the center line of the pulling lever 15. Since P need only be at a position where the rotation direction of the pull-up lever 15 can be switched when a predetermined pulling force is applied to the governor rope, in association with the elastic force of the coil spring 27,
There may be a case where it is not substantially on the center line of the pulling lever 15.

[0019]

As described above, the emergency stop device for an elevator according to the present invention is disposed below the elevating body, and when the pulling force of the governor rope exceeds a predetermined value, the braking device is displaced upward. An emergency stop mechanism for the child to be pressed by the guide rail to perform an emergency stop of the elevating body, one side is locked to the governor rope, the other side is pivotally supported, and rotates by the pulling force of the governor rope, A pull-up member for displacing the brake element upward, and malfunction preventing means for restricting rotation of the pull-up member in normal times to prevent a malfunction of the emergency stop mechanism; A cam provided at the side end, and a presser provided on the malfunction preventing means and urged by an urging member to press the cam to generate a rotating force on the pull-up member; When the lifting member is in the normal position, When the cam is generated in the direction of pushing down one side of the lifting member, and when the lifting member is near the emergency stop position, the cam is generated in the direction of pushing up one side of the lifting member. Is formed.
Therefore, in normal times, the urging member of the malfunction preventing means urges the cam surface of the pull-up member in the direction of suppressing the upward rotation, so that the malfunction of the brake element of the emergency stop mechanism moves upward. On the other hand, in the event of an emergency stop, the urging member of the malfunction preventing means urges the cam surface of the pull-up member in a direction that promotes upward rotation. The operation delay due to the urging force of the means can be reduced. Then, even if the pulling force of the governor rope is reduced to near the malfunction preventing force for some reason, the emergency stop mechanism can be operated to reliably stop the elevator car.

[Brief description of the drawings]

FIG. 1 is a main part front view showing an emergency stop device for an elevator according to one embodiment of the present invention.

FIG. 2 is a front view showing the entirety of a conventional elevator emergency stop device.

FIG. 3 is a main part front view of a conventional elevator emergency stop device.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 Reference Signs List 5 elevator car 6 counterweight 7 car emergency stop mechanism 9, 12 speed governor rope 10 counterweight emergency stop mechanism 13 guide rail 15 lifting lever 19 brake 21 spring 24 malfunction prevention means 25 curved seat 27 coil spring

Claims (1)

(57) [Claims] 1. A speed governor rope disposed at a lower portion of an elevating body.
When the tensile force of
The moving element is pressed by the guide rail to perform emergency stop of the elevating body.
Emergency stop mechanism, one side is locked to the governor rope, the other
Is pivoted by the pulling force of the governor rope
A lifting member for displacing the brake element upward;
The emergency stop device by restricting the rotation of the lifting member at
A malfunction prevention means for preventing a malfunction of the structure is provided.
In the emergency stop device for a elevator, a cam provided at the other end of the lifting member and the malfunction
The cam is urged by an urging member provided in the operation preventing means.
And a pressing element that generates a rotational power to the lifting member.
The rotating force generated by the pressing element is pulled up.
When the member is in the normal position,
It occurs in the direction of pushing down, and the lifting member
When it is near the stop position, push one side of the pulling member up
An emergency stop device for an elevator, wherein the cam is formed so as to be generated in a direction in which the elevator stops.