JP6807768B2 - Elevator governor - Google Patents

Description

The present invention relates to a speed governor provided as one of elevator safety devices and forcibly shuts off the power supply from a power source when the car travels beyond a preset speed.

As a speed governor of this type of elevator, for example, the one described in Patent Document 1 has been proposed. In the speed governor described in Patent Document 1, the main focus is on the operating mechanism of the limit switch that functions as an overspeed detection switch incidental to the speed governor, and the limit switch operating mechanism is a base. It has a lever, a cam and a limit switch. Then, the lever is rotatably supported by the base. The cam is provided integrally with the lever, and has a concave portion on the outer peripheral surface in which a part of a concentric circle is displaced in the concentric direction with respect to the rotation center of the lever. The limit switch has an actuator and is fixed to the base. The actuator is urged toward the rotation center of the cam in a state of being in contact with the outer peripheral surface of the cam, and as the cam rotates, it follows the outer peripheral surface of the cam in the radial direction with respect to the rotation center. It is supposed to be displaced.

Japanese Unexamined Patent Publication No. 2008-094544

However, in the structure of the speed governor described in Patent Document 1, when the overspeed of the elevator car is detected, the roller plunger type actuator of the limit switch moves from the recess of the cam as the cam integrated with the lever rotates. Although the cam moves so as to come out and ride on the outer peripheral surface of the cam, the outer peripheral surface of the cam is concentric and concentric with the center of rotation of the cam (Patent Document 1). See paragraph [0015]). When the actuator of the limit switch reaches the concentric circles of the cam, the actuator is urged toward the center of rotation of the cam, so that no rotational torque is generated in the cam.

Therefore, when the actuator of the limit switch rides on the concentric circles of the cam, for example, when an unexpected vibration or impact is received, the cam rotates and displaces, and the limit switch as an overspeed detection switch unintentionally becomes. There was a risk that it would be restored to its original state.

The present invention has been made by paying attention to such a problem, and the overspeed detection switch is not restored even when an unexpected vibration or impact is received, especially in an overspeed detection state. It provides an elevator speed governor that is considered as such.

According to the present invention, the governor sheaves arranged at the upper part and the lower part of the hoistway where the elevator car travels are wound between the governor sheaves and the pair of cabana sheaves, and are connected to the car and run by the car. A governor rope that travels along with movement and a fly weight that is attached to one of the pair of governor sheaves and can move in the radial direction of the governor sheave, and a governor sheave having the fly weight are arranged close to each other. It includes a tripper that swings when it comes into contact with the fly weight, and an overspeed detection switch that is arranged close to the tripper and has a retractable presser that is pressed by the tripper. This is an elevator speed governor that operates when the moving speed of the car becomes faster than a preset speed to stop the car.

On top of that, the tripper is concentric with the swing center of the tripper itself and the lever portion that points in the direction of the rotation center of the governor sheave having the fly weight and functions as a contact portion with the fly weight. It has an arcuate surface similar to an arc, and a notch recess formed so as to be recessed toward the swing center of the tripper at a position of the arcuate surface isolated from the lever portion.

Then, in a normal state, the presser of the overspeed detection switch is engaged with the notch recess while pointing in the direction of the swing center of the tripper, so that the relative position between the presser and the tripper is regulated. hand which are, when overspeed is due to the swinging operation of the tripper, the pushing element of the overspeed detection switch is turned to such pushing element by rides on the arcuate surface exits from the cutout recess is pressed The arcuate surface is characterized in that the component force of the reaction force exerted when the presser rides on the arcuate surface is directed in a direction deviating from the swing center of the tripper. Is.

In a desirable embodiment, the arcuate surface has a direction in which the component force in the direction perpendicular to the tangential direction of the contact point when the presser rides on the arcuate surface deviates from the swing center of the tripper. It is assumed that the shape is oriented.

Further, as a desirable embodiment, the shape of the arcuate surface including the notch recess is formed symmetrically with respect to the direction in which the presser of the overspeed detection switch is directed in the normal state.

The same desirable manner, the overspeed detection switch is assumed to be constantly urged by resilient means incorporated in the casing in a direction projecting from the presser cliff over scan.

In a more preferred embodiment, the tripper and the overspeed detection switch are both supported by a support on which a governor sieve having the fly weight is supported, and between the tripper and the support, the tripper It is assumed that a stopper means for regulating the amount of swing displacement is provided.

As a more desirable embodiment, it is assumed that a recovery means for restoring the tripper in the overspeed detection state to the normal state is provided between the tripper and the support.

Therefore, in the present invention, the component force of the pressing force exerted on the arcuate surface of the tripper by the presser riding on the arcuate surface of the tripper is directed in the direction deviating from the swing center of the tripper. A rotational torque that attempts to further rotate the tripper acts on the tripper. Therefore, even if an unexpected vibration or impact is received, it can be countered.

According to the present invention, it is possible to prevent a situation in which the overspeed detection switch is unintentionally restored even when an unexpected vibration or impact is received in the overspeed detection state. It can contribute to further improvement of safety.

It is a figure which shows the more specific embodiment of the speed governor of the elevator which concerns on this invention, and is the schematic explanatory drawing of the elevator which includes the speed governor. An enlarged explanatory view showing the details of the speed governor shown in FIG. An enlarged view of a main part centering on a tripper and a limit switch (overspeed detection switch) in the speed governor shown in FIG. An enlarged view of the tripper alone shown in FIG. Explanatory drawing when overspeed detection from the state of FIG. Explanatory drawing of the force exerted on the tripper by the roller plunger (pressor) of the limit switch at the time of overspeed detection. An enlarged explanatory view of a recovery mechanism attached to a tripper and a limit switch of the speed governor shown in FIG.

FIGS. 1 to 7 show a more specific first mode for carrying out the speed governor of the elevator according to the present invention, and FIG. 1 particularly shows a schematic structure of an elevator including the speed governor.

The elevator shown in FIG. 1 is a so-called traction in which a car 2 is suspended at one end of a main rope (main rope) 1 wound around a hoist (not shown) and a counterweight (not shown) is suspended at the other end. This is a well-known structure in which the car 2 and the counterweight move (elevate) in the hoistway, which is also not shown, by driving the main rope 1 with the hoisting machine. A plurality of guide shoes 3 are provided above and below the car 2, and these guide shoes 3 are guided by the guide rails, but the guide rails are not shown in FIG. Further, an emergency stop mechanism 13, which will be described later, is arranged in the vicinity of the lower guide shoe 3.

A speed governor 5 having a lower governor 4 as a main element is arranged in the lower part of the hoistway, and an upper governor (rope tension vehicle for speed governor) 6 is arranged in the upper part of the hoistway. A tension weight 8 having a predetermined weight housed in the weight case 7 is suspended and supported on the rotation center of the lower governor sheave 4. An endless (endless) governor rope (speed governor rope) 9 is wound between the governor sheaves 4 and 6. As a result, tension is applied to the governor rope 9 according to the weight of the entire speed governor 5 including the weight case 7 and the tension weight 8.

In the present embodiment, the lower governor sheave 4 side is the speed governor 5, but it is of course possible to use the upper governor sheave 6 side as the speed governor. Further, the governor rope 9 has a well-known structure in which a plurality of strands (stranded wires) are further twisted together with a central fiber. Further, the speed governor 5 including the weight case 7 and the tension weight 8 is provided with a steady rest by a steady rest mechanism (not shown).

On the other hand, the link mechanism 10 of the emergency stop mechanism 13 is attached to the car 2 side. Bell cranks 11a and 11b are provided at both ends of the link mechanism 10, and lift rods 12 extending downward are connected to the bell cranks 11a and 11b, respectively. One of the bell cranks 11a is connected to the connecting portion 9c of the driving side 9a of the governor rope 9, and each lift rod 12 is connected to the emergency stopping mechanism 13 at the lower part of the car 2.

As a result, the governor rope 9 travels between the upper governor sheave 6 and the lower governor sheave 4 as the car 2 travels, and the lower governor sheave 4 on the speed governor 5 side rotates. Then, the speed governor 5 and the emergency stop mechanism 13 prevent the car 2 from traveling at a speed higher than the set speed, and function as a safety device for safely stopping the car 2.

Specifically, when the overspeed of the car 2 described later is detected, the speed governor 5 forcibly stops the movement of the governor rope 9, so that the link mechanism 10 operates accordingly, and the lift rod in the link mechanism 10 operates. When the 12 is relatively pulled up, the emergency stop mechanism 13 on the car 2 side is activated. The emergency stop mechanism 13 has a known structure including, for example, a combination of a wedge and a taper block, and the operation of the emergency stop mechanism 13 grips the guide rail to stop the movement of the car 2.

The bell crank 11a of the link mechanism 10 is connected to the connecting portion 9c on the left side of the governor rope 9 shown in FIG. 1, and the governor rope 9 travels and moves according to the traveling movement of the car 2. However, since the connecting portion 9c does not exceed the lower governor sheave 4 and the upper governor sheave 6, the left side portion of the governor rope 9 shown in FIG. 1 is referred to as the drive side 9a of the governor rope 9 and the right portion. Is referred to as the driven side 9b of the governor rope 9.

FIG. 2 is an explanatory view showing the details of the governor 5 shown in FIG. 1, and FIG. 3 shows an enlarged view of a main part centering on the tripper 15 and the limit switch 16 described later in FIG. There is.

As shown in FIGS. 2 and 3, the speed governor 5 includes the upper governor sheave 6, the lower governor sheave 4 and the governor rope 9 described above, as well as the fly weight 14 and the tripper 15 arranged close to the lower governor sheave 4. , A limit switch 16 or the like that functions as an overspeed detection switch is provided. On the upper half side of the lower governor sheave 4, a weight frame 17 that also serves as a tension weight and a frame 22 that functions as a support are mounted from the lateral direction so as not to interfere with the lower governor sheave 4 and the governor rope 9, and the bolt 17a They are fastened and fixed to each other. A lower governor sheave 4 is rotatably supported by a shaft member 26 in a bearing on the frame 22. Then, the weight frame 17 and the frame 22 function as a weight case 7 including the tension weight 8 shown in FIG.

The fly weights 14 shown in FIG. 2 are assembled to the lower governor receive 4 in pairs. These fly weights 14 are provided in a rotationally symmetric manner with the rotation center of the lower governor sheave 4 as the center of symmetry. Further, each fly weight 14 has a circular weight body 14b fixed to a plate-shaped lever member 14a that can swing around the pin 18 as a swing center, and the lever members 14a are connected to each other by a rod 19. ing. Further, both fly weights 14 are urged toward the rotation center of the lower governor receive 4 by a spring member (not shown). Then, when the governor rope 9 travels along with the traveling movement of the car 2 and both governor sheaves 4 and 6 rotate, the fly weight 14 incorporated in the lower governor sheave 4 moves away from the center of the lower governor sheave 4 by centrifugal force, that is, The lower governor sheave 4 will be displaced or moved radially outward.

Further, the lower governor sheave 4 is provided with a ratchet wheel 20 that is coaxial with the lower governor sheave 4 and cannot rotate relative to the lower governor sheave 4, and the ratchet 21 corresponding to the ratchet wheel 20 is a lever member 14a. It is provided coaxially with the pin 18. Then, when the car 2 continues to overspeed even after the limit switch 16 as the overspeed detection switch described above is activated, these ratchet wheels 20 and the ratchet 21 mesh with each other to cause the lower governor receive 4. It works to stop the movement of the speed controller 5, and eventually the movement of the speed governor 5.

As shown in FIG. 2, a tripper 15 and a limit switch 16 functioning as an overspeed detection switch are mounted on the inner side surface side of the frame 22. The tripper 15 is pivotally supported by the frame 22 by a bolt-shaped pin 23, while the limit switch 16 is in a posture in which the roller plunger 16a, which is a pressor thereof, comes into contact with a part of the tripper 15. It is fixed to the frame 22 with screws 24. The tripper 15 is one of the adjustment bolts 25 (see FIG. 3) on the fly weight 14 side that are displaced outward in the radial direction of the lower governor sheave 4 by centrifugal force when the traveling speed of the car 2 exceeds a preset speed. It is provided at a position where it can come into contact with the portion.

Here, FIG. 4 shows the details of the tripper 15 shown in FIG. 3 as viewed from the back side. As shown in the figure, the tripper 15 has a deformed shape in which the upper portion is formed as a substantially semicircular large diameter portion 15a and the narrow lever portion 15b extending downward from the large diameter portion 15a is integrally formed. It is a plate. The tripper 15 has a standing piece 15c formed by bending at a right angle across both the large diameter portion 15a and the lever portion 15b, and only a part of the lever portion 15b at a right angle at a position opposite to the standing piece 15c. It has an upright piece 15d formed by bending into a right angle. Further, the large diameter portion 15a is formed with a shaft hole 27 for the bolt-shaped pin 23 shown in FIG. 3, and the outer peripheral surface of the large diameter portion 15a is an arcuate surface 28, which is a circle. A notch recess 29 recessed in a substantially V-groove shape toward the center of rotation of the tripper 15 itself is formed in a part of the arcuate surface 28.

Then, as shown in FIG. 4, the center line Q1 that passes through the center of the shaft hole 27 and divides the width dimension of the lever portion 15b into two is the shaft member 26 that is the rotation center of the lower governor sheave 4 as shown in FIG. It is preset so as to coincide with the line connecting the center and the center of the shaft hole 27 (pin 23). Further, as shown in FIGS. 3 and 4, the line connecting the center of the shaft hole 27 of the tripper 15 and the deepest portion of the substantially V-groove-shaped notch recess 29 is the appearance of the roller plunger 16a with respect to the case 30 of the limit switch 16. It is preset to match the direction.

That is, as shown in FIGS. 3 and 4, the tripper 15 swingably supported by the frame 22 (see FIG. 2) by the pin 23 and the shaft hole 27 rotates the lower governor sheave 4 in the longitudinal direction of the lever portion 15b. When directed to the central shaft member 26, the notch recess 29 on the large diameter portion 15a side is set so as to coincide with the infestation direction of the roller plunger 16a in the limit switch 16. In this state, the roller plunger 16a of the limit switch 16 falls into the notch recess 29 on the large diameter portion 15a side and engages with the roller plunger 16a to self-hold the state.

Then, as shown in FIG. 4, the arcuate surface 28 in the large diameter portion 15a of the tripper 15 is in the direction of the center line Q2 connecting the center of the shaft hole 27 of the tripper 15 and the deepest portion of the notch recess 29. It is formed as an elliptical arcuate surface with a major axis. Further, the elliptical arcuate surface 28 including the notch recess 29 is formed symmetrically with the center line Q2 as the center of symmetry. As shown in FIG. 3, the tripper 15 has a pair of bolt-shaped stopper pins 31 projecting concentrically with the pins 23, and these stopper pins 31 are as shown in FIG. 7 to be described later. It is engaged with an arc-shaped and elongated hole-shaped slot portion 32 formed on the frame 22 side. As a result, the swing range of the tripper 15 is regulated within the range of the length of the slot portion 32, and the stopper pin 31 and the slot portion 32 form a stopper means for regulating the swing range of the tripper 15. ..

The limit switch 16 as an acceleration detection switch shown in FIGS. 2 and 3 is a so-called roller plunger type limit switch provided with a roller plunger 16a which can appear and disappear as a presser having a roller mounted on the tip thereof, and is a roller plunger 16a. Is urged in a direction protruding from the case 30 by a spring member as a built-in elastic means. Therefore, as shown in FIGS. 2 and 3, when the roller plunger 16a is depressed and engaged with the notch recess 29 of the tripper 15, the two are pressed against each other with a slight spring force. Further, the limit switch 16 is of a so-called normally closed type (normally closed type) with a forced opening mechanism in which the contacts of the built-in micro switch are forcibly opened when the roller plunger 16a is pushed by an external force by a predetermined stroke. It is a limit switch. Then, the contact point of the micro switch in the limit switch 16 is connected in series with, for example, the power supply of the hoisting machine (not shown) for running the car 2. The limit switch 16 is generally commercially available. Further, the limit switch 16 is attached with a cable 16b (see FIG. 2) for signal output.

In the speed governor 5 configured in this way, as described above, when the lower governor sheave 4 rotates with the traveling movement of the car 2, the fly weight 14 incorporated in the lower governor sheave 4 causes centrifugal force. Displaces in the direction away from the center of the lower governor sheave 4, that is, outward in the radial direction of the lower governor sheave 4. When the traveling speed of the car 2 becomes faster than the preset speed, the head of the adjusting bolt 25 attached to a part of the fly weight 14 comes into contact with the lever portion 15b of the tripper 15, for example, FIG. It changes from the state of 3 to the state of FIG. That is, as shown in FIG. 5, the tripper 15 is flipped up by the fly weight 14 so that the tripper 15 is oscillated and displaced in the clockwise direction about the pin 23.

As a result, the roller plunger 16a of the limit switch 16 that has been engaged with the notch recess 29 of the tripper 15 comes out of the notch recess 29 and rides on the arcuate surface 28 of the large diameter portion 15a of the tripper 15. As a result, the roller plunger 16a of the limit switch 16 is pushed in by the difference in height between the notch recess 29 and the arcuate surface 28, and the contacts of the built-in micro switch are forcibly separated. .. This means that, as described above, the power supply of the hoisting machine (not shown) for running the car 2 is cut off.

In this case, the arcuate surface 28 on the tripper 15 side on which the roller plunger 16a of the limit switch 16 rides is formed as an elliptical surface having a major axis in the direction of the center line Q2 shown in FIG. As mentioned in.

FIG. 6 shows the relationship between the forces exerted on the tripper 15 by the roller plunger 16a of the limit switch 16 that has come out of the notch recess 29 in the large diameter portion 15a of the tripper 15. It was mentioned earlier that the arcuate surface 28 on the large diameter portion 15a side of the tripper 15 is formed as an elliptical surface having a major axis in the direction of the center line Q2 in FIG. Therefore, the reaction force F1 caused by the roller plunger 16a of the limit switch 16 being pushed into the case 30 is orthogonal to the component force F2 in the direction of the tangent line P of the contact point of the roller plunger 16a with respect to the arcuate surface 28 and the tangent line P. It will generate a component force F3 in the direction of Then, the component force F3 in the direction orthogonal to the tangent line P is directed in a direction deviated from the center of the pin 23 which is the swing center of the tripper 15.

That is, since the arcuate surface 28 of the tripper 15 is formed as an elliptical one having a major axis in the direction of the center line Q2, the contact point when the roller plunger 16a rides on the elliptical arcuate surface 28. The component force F3 in the direction perpendicular to the direction of the tangent line P of the tripper 15 does not direct the direction of the pin 23 which is the swing center of the tripper 15. This means that, in the state of FIG. 6, a rotational torque in the direction of arrow R is acting on the tripper 15 based on the component force F3. Therefore, in the acceleration detection state, the state of FIG. 5 can be self-maintained, and even if an unexpected vibration or impact is received, the state of FIG. 5 can counteract it.

That is, in the state of FIG. 6, the roller plunger 16a cannot autonomously return to the notch recess 29 of the tripper 15 in the direction in which the roller plunger 16a falls, and as a result, the limit switch 16 is unintentionally restored. Can be prevented in advance, which in turn can contribute to further improvement in safety.

The arcuate surface 28 of the tripper 15 is formed as an elliptical shape having a major axis in the direction of the center line Q2, and at the same time, is formed as a symmetrical shape with the center line Q2 as the center of symmetry. It goes without saying that the same function as described above is exhibited even when the tripper 15 is oscillated and displaced in the counterclockwise direction, contrary to the cases of 5 and 6. If the component force F3 of FIG. 6 can be generated, the outer peripheral surface of the large diameter portion 15a in the tripper 15 does not necessarily have to be an elliptical arcuate surface, for example, an involute-shaped surface or the like. Is also good.

Here, the frame 22 shown in FIG. 2 is provided with a recovery mechanism for restoring the tripper 15 and the limit switch 16 operated at the time of overspeed detection to the normal state as described above. The restoration mechanism is intentionally omitted in order to avoid complications.

Therefore, the details of the recovery mechanism will be described with reference to another FIG. 7 in which the main part of FIG. 2 is enlarged. In FIG. 7, in addition to the fly weight 14, the arrangement relationship of the frame 22, the tripper 15, and the limit switch 16 is the same as those shown in FIGS. 2 and 3.

As shown in FIG. 7, a slide plate 33 is arranged on the frame 22 so as to partially overlap the tripper 15 and the limit switch 16 on the inner side surface side thereof. In the slide plate 33, a wide guide portion 33a and an extension portion 33b narrower than the guide portion 33a are formed in series, and the extension portion 33b is formed with an elongated hole-shaped straight slot portion 34. There is. The slide plate 33 has a guide portion 33a guided by a pair of slide guides 35 and an elongated hole-shaped slot formed in the extension portion 33b so that the slide plate 33 can slide in the direction of appearance of the roller plunger 16a in the limit switch 16. The portion 34 is guided by engaging with a pair of screws 36 screwed and fixed to the frame 22.

A pair of bolt-shaped shoulder portions 37 formed with a step in the width direction between the guide portion 33a and the extension portion 33b of the slide plate 33 project from the slot portion 32 on the frame 22 side at a predetermined distance. It faces the tip of the stopper pin 31 of. The pair of bolt-shaped pins 31 are erected on the large diameter portion 15a of the tripper 15 shown in FIG. 3, and as described above, the swing range of the tripper 15 is restricted together with the slot portion 32. A stopper means is formed.

Further, the slide plate 33 is urged in a form of being pulled to the right in the figure by a tension coil spring 38 stretched between the wide guide portion 33a and the frame 22. On the other hand, at a position of the frame 22 facing the tip of the extension portion 33b on the slide plate 33, one terminal portion of the outer tube 39b of the pull wire 39, which protects the wire 39a with the outer tube 39b, is interposed via the bracket 40. Is fixed. Then, one terminal portion of the wire 39a protruding from the outer tube 39b is connected to the tip of the extension portion 33b of the slide plate 33 by a screw 41.

The other terminal portion of the outer tube 39b of the pull wire 39 is fixed at an appropriate remote position that does not interfere with the original function of the elevator, and the wire 39a protruding from the other terminal portion of the outer tube 39b. The other end is connected to, for example, a solenoid as an electromagnetic actuator (not shown) for pull operation. As described above, at least the slide plate 33 and the pull wire 39 constitute a remote controllable recovery mechanism for the tripper 15 and the limit switch 16. In this case, the pull operation of the wire 39a in the pull wire 39 can be a manual operation instead of the pull operation by electromagnetic drive if a handle or the like is connected instead of the solenoid.

Therefore, as described above, when the tripper 15 swings and displaces in the clockwise direction or the counterclockwise direction during overspeed detection, the pair of bolt-shaped stopper pins 31 and the slot portion 32 shown in FIG. 7 are relatively displaced. However, the swing displacement of the tripper 15 is restricted within the length range of the slot portion 32 in any rotation direction, and the rotation direction of the tripper 15 is either clockwise or counterclockwise. Regardless of this, the pair of stopper pins 31 are always located in the slot portion 32.

Therefore, in order to restore the tripper 15 and the limit switch 16 to the normal state after taking a predetermined measure at the time of overspeed detection as described above, the wire 39a of the pull wire 39 is towed by remote control (pull operation). It shall be. When the wire 39a of FIG. 7 is towed in the overspeed detection state as shown in FIG. 5, the slide plate 33 connected to the wire 39a overcomes the spring force of the tension coil spring 38 and slides to the left in the figure. Moving.

When the slide plate 33 slides and moves, the shoulder portion 37 comes into contact with one of the pair of stopper pins 31, and the tripper 15 and the limit switch 16 are restored to the normal state as shown in FIG. Even if the tripper 15 is oscillated and displaced in the direction opposite to that in FIG. 5, the behavior at the time of restoration based on the pulling operation of the wire 39a of the pull wire 39 is exactly the same as in the above case. That is, the tripper 15 can be rotated (swinged) in both the counterclockwise direction and the clockwise direction by the slide displacement of the slide plate 33 based on the pulling operation of the pull wire 39.

According to the present embodiment provided with such a recovery mechanism, the tripper 15 and the limit switch 16 are smoothly operated by pulling the pull wire 39 from a remote position at the time of overspeed detection, although the structure is simple. It will be possible to restore to the normal state reliably and reliably.

2 ... Car 4 ... Lower governor sheave 5 ... Speed governor 6 ... Upper governor sheave 9 ... Governor rope 14 ... Fly weight 15 ... Tripper 15a ... Large diameter part 15b ... Lever part 16 ... Limit switch (overspeed detection switch)
16a ... Roller plunger (pressor)
22 ... Frame (support)
28 ... Arc-shaped surface 29 ... Notched recess 31 ... Stopper pin (stopper means)
32 ... Slot part (stopper means)
33 ... Slide plate (restoration means)
39 ... Pull wire (recovery means)

Claims (6)

Governor sheaves located at the top and bottom of the hoistway where the elevator car travels, respectively.
A governor rope that is wound between the pair of cabana sheaves, is connected to the car, and moves along with the running movement of the car.
A fly weight that is attached to one of the pair of governor sheaves and can move in the radial direction of the governor sheave.
A tripper that is placed close to the governor sheave having the fly weight and swings when it comes into contact with the fly weight.
An overspeed detection switch having a retractable presser that is placed close to the tripper and is pressed by the tripper,
Is equipped with
It is an elevator speed governor that operates when the moving speed of the car becomes faster than a preset speed to stop the car.
The above tripper is
A lever portion that points in the direction of the center of rotation of the governor sheave having the fly weight and functions as a contact portion with the fly weight.
An arcuate surface similar to an arc concentric with the swing center of the tripper itself,
A notch recess formed so as to be recessed toward the swing center of the tripper at a position isolated from the lever portion in the arcuate surface,
Have
Normally, the relative position of the presser and the tripper is regulated by engaging the presser of the overspeed detection switch with the notch recess while pointing the direction of the swing center of the tripper. ,
At the time of overspeed , the presser of the overspeed detection switch escapes from the notch recess and rides on the arcuate surface as the tripper swings, so that the presser is pushed in.
The arcuate surface of the elevator is characterized in that the component force of the reaction force exerted when the presser rides on the arcuate surface is directed in a direction deviating from the swing center of the tripper. Speed governor. The arcuate surface has a shape in which the component force in the direction perpendicular to the tangential direction of the contact point when the presser rides on the arcuate surface points in a direction deviating from the swing center of the tripper. The speed governor of the elevator according to claim 1, wherein the speed governor is characterized by the above. The elevator according to claim 2, wherein the shape of the arcuate surface including the notch recess is formed symmetrically with respect to the direction in which the presser of the overspeed detection switch is directed in a normal state. Speed governor. The overspeed detection switch, the presser cliff over the elevator according to claim 3, characterized in that it is constantly urged by resilient means incorporated in the casing in a direction to protrude from the scan governor .. The tripper and the overspeed detection switch are both supported by a support on which a governor sieve having the fly weight is supported.
The speed governor for an elevator according to claim 4, wherein a stopper means for regulating the amount of swing displacement of the tripper is provided between the tripper and the support. The speed governor of the elevator according to claim 5, wherein a recovery means for restoring the tripper in the overspeed detection state to a normal state is provided between the tripper and the support. Machine.

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