JPS6326376Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a safety device for an elevator.

[Technical background of the invention]

Generally, elevators are equipped with a safety device that causes the car to come to an emergency stop when the car descends at an abnormal speed. FIG. 1 schematically shows an elevator equipped with the above-mentioned safety device, in which a car 1 is suspended from a main rope 2, and a hoisting machine (not shown) provided in a machine room 3 is attached to the main rope 2. It is designed to move up and down while being guided by the guide rail 4 by the feeding drive of the guide rail 4. The car 1 consists of a car chamber 1a and a car frame 1b, and upper guide shoes (or roller guides) 5a are provided on both sides of the upper part (both ends of the upper beam of the car frame 1b),
Lower guide shoes (or roller guides) 5b having an emergency brake 6 are provided on both sides of the lower part of the car (both ends of the lower beam of the car frame 1b). In addition, a governor 7 is provided in the machine room 3 at the top of the hoistway to detect when the speed of the car 1 becomes abnormally high. It is designed to be driven by a governor rope 8 that is This governor rope 8
is wrapped around the governor 7 and tensioner 9, and its both ends are attached to the tip of a rope lever 10 that is movable up and down at the top of the car 1 (the upper beam of the car frame 1b). Rope stopper member 11
Fixed. On the other hand, on both sides of car 1,
Lift rods 12 are provided for operating the emergency brake 6, and these lift rods 12 operate a link mechanism (not shown, but provided at the top of the car) by rotating the rope lever 10 upward. The emergency brake 6 is actuated by being pulled up through the brake lever. Note that the lift rod 1 on the side where the rope lever 10 is provided
The link mechanism that pulls up the lift rod 12 on the other side and the link mechanism that pulls up the lift rod 12 on the other side are the connecting rod 13.
are connected to each other via. Also,
The link mechanism and the rope lever 10 are restrained from rotating by spring force, so that the rope lever 10 does not rotate at all times, but moves the governor rope 8 in accordance with the rise and fall of the car 1. It's summery. Therefore, the governor rope 8 is always moved at the same speed as the car 1, following the up-and-down movement of the car 1. On the other hand, if the descending speed of the car 1 becomes abnormally fast for some reason during the descending operation of the elevator, and this is detected by the governor 7, the governor 7 cuts off the power to the hoisting machine, and then the brake system of the hoisting machine At the same time, a governor rope clamp device (not shown) is activated to stop the governor rope 8. In this case, the governor rope 8 will stop immediately, but the heavy car 1 will descend due to inertia to some extent even when the hoisting machine is braked, so the relative position between the car 1 and the governor rope 8 will change. Therefore, the rope lever 10 is forcibly rotated upward against the spring force. When the rope lever 10 rotates upward in this way, the lift levers 12 on both sides of the car are connected via the link mechanism.
are pulled up at the same time, and as a result, the emergency brakes 6 on both sides operate simultaneously, and the car guide rail 4
to safely stop car 1. Note that the rail clamp of this safety device can be released by once raising the car 1. When the car 1 is raised, the emergency brake 6 is activated to release the guide rail by raising the car 1. 4, the lift rod 12, link mechanism and rope lever 10 return to their original states due to the spring force.

By the way, in the safety device as mentioned above,
Even if a passenger in the car 1 inadvertently jumps and applies a shock to the car 1, this shock is directly transmitted to the governor rope 8 via the rope lever 10, and the governor rope 8
The impact applied to the car 1 causes it to move up and down rapidly or shake violently, causing the governor 7 to momentarily drive at high speed, and the governor 7 detects the speed at that time as an abnormal speed. Then, even though the elevator is operating normally, the hoist is stopped and the governor rope 8 is clamped, and the safety device is activated due to the stop of the governor rope 8, causing the car 1 to stop.

For this reason, the above-mentioned safety device needs to be configured so that the impact that is applied to the car 1 by a passenger jumping and the like and does not affect the operation of the elevator is not transmitted to the governor rope 8. In the above-mentioned safety device, the rope lever 10 is allowed to freely rotate by a predetermined angle with respect to the link mechanism that pulls up the lift rod 12, and the vibration of the car 1 when an impact is applied to the car 1, that is, the rope lever 10 is reduced. Rope lever 10 changes the fulcrum position
The vertical movement of the car is absorbed without operating the link mechanism, and the impact applied to the car 1 is prevented from being transmitted to the governor rope 8.

FIGS. 2 to 4 show the structure of a rope lever 10 and a linkage mechanism in a conventional safety device.
is freely fitted to a horizontal link shaft 14 rotatably provided on the upper beam of the car frame 1b, and is supported so as to be movable up and down. Further, the link mechanism for lifting the lift lever 12 that operates the emergency brake 6 shown in FIG.
The lift arm 15 is fixed to the link shaft 14 and rotates integrally with the link shaft 14, and the lift rod 12 is connected to the lift arm 1.
It is pivotally connected to the tip of 5. The rope lever 10 has a U-shaped lever holder 1 which is fixed to the link shaft 14 via a fixed arm 16 and which holds the rope lever 10 from above and below with ample space.
7 via a pair of upper and lower spring members 18. In addition, 19 in the figure is a stopper bolt that restricts the rotation range of the rope lever 10 within the lever receiver 17. Reference numeral 13 denotes a connecting rod that connects the link mechanisms on both sides of the car, and this connecting rod 13 is pivotally connected to an arm 20 fixed to the link shaft 14 by a pin 21. Note that although the figure only shows the link mechanism on the side where the rope lever 10 is provided, the link mechanism on the opposite side is also composed of a link shaft and a lift lever in the same way as the one shown in the figure (however, the lever holder is not included). (No) Reference numeral 22 denotes a coil spring that restrains the link mechanism from operating unnecessarily, and this link mechanism restraining spring 22
It is held in a compressed state between a bracket 23 fixed to the upper beam of the car frame 1b and a spring receiving nut 24 screwed onto the connecting rod 13, thereby restraining the movement of the connecting rod 13. This restrains the link mechanism from operating unnecessarily. 25
is a stopper nut screwed onto the connecting rod 13, and the initial position of the connecting rod 13 and the link mechanism is adjusted by turning this stopper nut 25 and moving it in the axial direction of the connecting rod 13. There is. In addition, the rope lever 1
Spring member 1 holding 0 in lever receiver 17
8 is a coil spring, and this coil spring 18 is used as the rope lever 10 and the lever receiver 1.
The rope lever 10 is compressed and attached between the rope lever 7 and the rope lever 10 so as to be supported with sufficient elastic force. Further, this coil spring 18 has a spring force that is weaker than the spring force of the link mechanism restraint spring 22 and greater than the force required to move the governor rope 8.
The governor rope 8 is moved while being restrained from rotating by the coil spring 18, following the rise and fall of the car.

However, in this safety device, when a passenger in the car jumps and applies a shock to the car, the fulcrum (link shaft 14) of the rope lever 10 is suddenly displaced due to the vibration of the car. Then, the rope lever 10 compresses the coil spring 18 and rotates within the lever receiver 17, so even if the fulcrum position of the rope lever 10 is suddenly displaced, the tip of the rope lever does not displace much, and therefore the car Even if a shock is applied to the governor rope 8, this shock is absorbed by the vertical movement of the rope lever 10 according to the displacement of the fulcrum, and the governor rope 8
Since almost no signal is transmitted to the car, there is no chance that the governor will detect abnormal speed and activate the safety device when an impact is applied to the car. Also,
When the car actually descends at an abnormal speed and the governor detects this and stops the governor rope 8,
Due to the change in the relative position between the car and the governor rope as described above, that is, the descent of the car alone, the rope lever 10 first rotates upward while compressing the coil spring 18 and hits the stopper bolt 19 of the lever receiver 17. As the car descends, the lever receiver 17 is pressed upward. When the pressing force of the lever receiver 17 becomes larger than the spring force of the link mechanism restraining spring 22, the lever receiver 1
7 is pushed by the rope lever 10 while compressing the link mechanism restraint spring 22 and rotates together with the link shaft 14, which causes the lift arm 15 to rotate upward to pull up the lift rod 12 and activate the emergency brake. Activate it to safely stop the car.

[Problems with background technology]

However, the above-mentioned conventional safety device uses a coil spring 18 as a spring member for restraining the rotation of the rope lever 10, and places the coil spring 18 between the rope lever 10 and the lever receiver 17 so that the rope lever 10 is sufficiently Since the coil spring 18 is attached in a compressed state so as to be supported by elastic force, the coil spring 18 must be compressed and inserted between the rope lever 10 and the lever receiver 17 when assembling the safety device. First, since this work is extremely difficult, there is a problem in that it is troublesome to assemble the safety device. Moreover, the rope lever 10
It is necessary to restrain the governor rope 8 with a spring force that is greater than the force necessary to move the governor rope 8 in order to move the governor rope 8 in accordance with the rise and fall of the car. The force increases as the lift stroke of the elevator becomes longer, that is, as the governor rope 8 becomes longer and the weight of the governor rope increases.
The spring force of the spring member that restricts the zero rotation needs to be adjusted according to the elevator's ascending and descending stroke. However, since the conventional safety device described above uses a coil spring as the spring member, the restraining spring force of the rope lever 10 can only be adjusted by using a coil spring with the required spring force. For this purpose, it is necessary to select and use the most suitable coil spring from among coil springs with various spring forces, making it extremely troublesome to adjust the restraining spring force of the rope lever 10.

[Purpose of the invention]

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to make it easy to assemble the spring that restricts the rotation of the rope lever. In addition, it is an object of the present invention to provide a safety device for an elevator in which the restraint spring force of a rope lever can be adjusted extremely easily.

[Summary of the idea]

That is, the present invention uses a leaf spring as a spring member that restrains the rotation of the rope lever, and a link shaft in which a required number of leaf springs are stacked and their base ends support the rope lever so that it can move up and down. At the same time, the rope lever is provided with a pair of spring receivers, and the tip of the leaf spring is inserted between the spring receivers, so that the rotation of the rope lever is restrained by the leaf spring. The leaf spring can be easily installed by simply inserting the tip end between the spring receivers and fixing the base end to the link shaft, which simplifies the assembly of the safety device. Moreover, by changing the number of leaf springs, the spring force of the entire stack of leaf springs can be changed, so the restraining spring force of the rope lever can be easily adjusted.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 5 to 9.

In FIG. 5, 10 is a rope lever;
The rope lever 10 is vertically rotatably supported by a link shaft 14 rotatably provided at the top of the car, and has a rope stopper 11 at its tip.
It is connected to the governor rope 8 via. Further, although not shown in the drawings, a lift arm is fixed to the link shaft 14 in the same manner as in conventional safety devices, and a link mechanism is configured for raising a lift rod that operates an emergency brake at the bottom of the car. Furthermore, an arm 20 is fixed to the link shaft 14, to which a connecting rod 13 that connects the link mechanisms on both sides of the car is pivotally connected by a pin 21, and a link mechanism restraining spring (not shown) that restrains the link mechanism. 1) is fitted onto the connecting rod 13 in the same manner as a conventional safety device. Reference numeral 17 denotes a U-shaped lever holder that holds the rope lever 10 from above and below with plenty of room.This lever holder 17 is fixed to the link shaft 14 by a fixed arm like a conventional safety device, and is held together with the link shaft 14. It is designed to rotate, and this lever receiver 17
A stopper bolt 19 is attached to the rope lever 10 to restrict the rotation range of the rope lever 10. 30 is a leaf spring provided as a spring member for restraining the rotation of the rope lever 10, and this leaf spring 30
The required number of leaf springs 30 are stacked so as to have the required spring force and their base ends are fixed to the link shaft 14, and the distal ends of the leaf springs 30 are connected to a pair of upper and lower ends provided on the rope lever 10. Spring receiving pin 3
1 and is hooked to the rope lever 10. Further, the base end of the leaf spring 30 fixed to the link shaft 14 comes into contact with a spring seat 32 formed by cutting out the side surface of the end of the link shaft 14, as shown in FIGS. 7 and 8. The leaf spring 30 is fixed to the link shaft 14 by tightening a fixing screw 35 which is screwed into a threaded hole 34 of the link shaft 14 through a mounting hole 33 provided in the leaf spring 30. Adjustment of the force, that is, adjustment of the restraining spring force of the rope lever 10, is performed by changing the number of leaf springs 30 and changing the spring force of the entire stack of leaf springs. The number of leaf springs 30 can be easily changed by removing the fixing screw 35, changing the number of leaf springs 30, and then tightening the fixing screw 35 again. Note that if the number of leaf springs 30 is increased, it becomes impossible to insert all the leaf springs between the spring receiving pins 31 of the rope lever 10, but in that case, as shown in FIG. You should use one with a short length. In addition, the spring force of the entire stack of leaf springs is similar to the spring force of the coil spring for restraining the rope lever in a conventional safety device.
The spring force is adjusted to be weaker than the spring force of the link mechanism restraint spring and greater than the force required to move the governor rope 8. Therefore, the rope lever 10 is normally restrained in its rotation and moves the governor rope 8 to follow the elevation and descent of the car, and when an impact is applied to the car, the rope lever 10 is prevented from moving due to the displacement of the link shaft 14 due to the vibration of the car. It rotates against the spring force of the leaf spring 30 and absorbs the impact applied to the car without transmitting it to the governor rope 8, and furthermore, when the governor detects an abnormal speed and stops the governor rope 8, The lever receiver 17 is pushed to rotate the link shaft 14 against the spring force of the link mechanism restraining spring, and the lift rod is pulled up via the lift arm 15 to operate the emergency brake.

On the other hand, in FIGS. 5 and 6, reference numeral 36 denotes a pair of lever clamping plates provided on both sides of the rope lever 10, and the upper end of the lever clamping plate 36 is attached to the lever receiver 17. They are supported by a support shaft 37 that can be rotated to open and close, and are connected to each other at the lower end by a connecting bolt 38 so as to be able to move toward and away from each other, and further by the spring force of a coil spring 39 fitted to the connecting bolt 38. The rope lever 10 is pressed against the rope lever 10, and the rope lever 10 is
A friction member 40 that slides into contact with is attached. This lever clamping plate 36 suppresses vibration of the rope lever 10 by always pressing the rope lever 10 with a constant frictional force using the friction member 40. If this vibration damping mechanism is provided, the rope lever Because it can also suppress its own vibration,
The vibrations transmitted to the governor rope 8 can be further reduced. The damping force of this damping mechanism can be arbitrarily adjusted by adjusting the spring force of the coil spring 39 using the spring receiver nut 41 and changing the pressing force of the friction member 40 against the rope lever 10. There is.

Therefore, in this safety device, the leaf spring 30 is used as a spring member to restrain the rotation of the rope lever 10, and by stacking the required number of leaf springs 30, the base end can be moved up and down the rope lever 10. At the same time, the rope lever 10 is provided with a pair of spring receiving pins 31, and the leaf spring 30 is fixed to the link shaft 14 supported by the rope lever 10.
By inserting the tip of this leaf spring 30
Since the rotation of the rope lever 10 is restrained, the plate spring 30 can be installed simply by inserting its tip between the spring receiving pins 31 and fixing its base to the link shaft 14. It is easy to perform the work, and therefore the safety device can be easily assembled, and by changing the number of leaf springs 30, the spring force of the entire stack of leaf springs can be changed. Also, the restraining spring force of the rope lever 10 can be easily adjusted.

In addition, in the above embodiment, a vibration damping mechanism is provided to suppress the vibration of the rope lever 10, but this vibration damping mechanism does not necessarily have to be provided.

[Effect of idea]

According to the present invention, the spring that restrains the rotation of the rope lever can be easily installed, and the assembly of the safety device can be simplified, and the restraining spring force of the rope lever can also be adjusted extremely easily. .

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an elevator equipped with a safety device, Figs. 2 and 3 are a front view and a plan view of the rope lever and link mechanism portion of the conventional safety device, and Fig. 4 is A-A in Fig. 2. It is a sectional view along the A line. Figures 5 to 9 show an embodiment of the present invention. Figure 5 is a front view of the rope lever and link mechanism of the safety device, and Figure 6 is taken along line B-B in Figure 5. 7 is an enlarged view of the leaf spring attachment part in Figure 5, Figure 8 is a perspective view showing the structure for fixing the leaf spring to the link shaft, and Figure 9 is a diagram showing the structure when the number of leaf springs is increased. It is a front view showing an example of leaf spring attachment. 8...Governor rope, 10...Rope lever,
14... Link shaft, 17... Lever receiver, 30...
...Plate spring, 31...Spring receiver pin, 32...Spring receiver, 33...Mounting hole, 35...Fixing screw.

Claims (1)

[Claims for Utility Model Registration] (1) The above-mentioned device is supported so as to be movable up and down on a link shaft rotatably provided in the upper part of the car, and is connected to a governor rope at its tip and restrained from rotation by a spring member. A rope lever that moves a governor rope to follow the elevation of the car; and a rope lever fixed to the link shaft that resists the spring force of the spring member by a change in relative position between the car and the governor rope, and moves the governor rope by a predetermined amount or more. A lever receiver that is pushed by the rope lever and rotates together with the link shaft when rotated, a lift arm that is fixed to the link shaft and rotates together with the link shaft, and a lift arm and a passenger car. An elevator safety device comprising a lift rod that is connected to an emergency brake installed at the bottom and is pulled up by rotation of the lift arm to operate the emergency brake, which restricts rotation of the rope lever. The spring member is a leaf spring, a required number of leaf springs are piled up and their base ends are fixed to the link shaft, and the rope lever is provided with a pair of spring receivers, and the tip end of the leaf spring is arranged between the spring receivers. An elevator safety device characterized by inserting. (2) The base end of the leaf spring is in contact with a spring seat formed by cutting out the side surface of the link shaft, and is attached to the link shaft by a fixing screw screwed into the link shaft through a mounting hole provided in the leaf spring. The elevator safety device according to claim (1) of the utility model registration, characterized in that the elevator safety device is fixed.