CN112707265B

CN112707265B - Elevator speed regulator

Info

Publication number: CN112707265B
Application number: CN202011077591.4A
Authority: CN
Inventors: 远藤广基
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2019-10-25
Filing date: 2020-10-10
Publication date: 2022-08-09
Anticipated expiration: 2040-10-10
Also published as: CN112707265A; JP2021066586A

Abstract

The invention provides an elevator governor which has a simple and universal structure, does not complicate the structure, and is easy to install and modify after installation, in order to prevent a governor rope from falling off from a governor sheave and ensure normal holding action of the governor rope. The governor (7) constitutes a safety mechanism for braking by sandwiching a governor rope (10) between a movable gripping member (26) and a fixed shoe when the lowering speed of the elevator car reaches a predetermined overspeed. In the governor (7), side walls (49) are disposed on the upper half-circumference of the governor sheave (8) so as to face the governor rope (10). The side walls (49) are surrounded by internal space widths (U, V) that are narrower than the maximum outer width (W) of the bearing brackets (22, 23) that support the governor sheave (8) in the axial direction. The side wall (49) is provided with blocking members (41) - (43) forming a governor rope fall-off prevention cover (40) on the upper half circumference of the governor sheave (8).

Description

Elevator speed regulator

Technical Field

The present invention relates to an elevator governor as a safety mechanism.

Background

Patent document 1 discloses a background art. This publication describes an elevator apparatus including an elevator governor, the elevator governor including: a speed-adjusting sling (hereinafter also referred to as "sling") connected to the lifting body; a sheave around which the sling is wound; a vibrating member that spreads radially outward of the sheave by centrifugal force according to a rotation speed of the sheave; a lock weight (hereinafter also referred to as a "movable holding element") that holds the hoist rope; and a hook portion configured to be rotatable about a rotation axis, support the lock weight by engaging with the lock weight, release the support of the lock weight by rotating in a first rotation direction about the rotation axis, and release the support of the lock weight by the hook portion by abutting the vibration member against the hook portion at an emergency stop speed of the elevator by spreading the vibration member radially outward of the sheave.

However, the elevator governor described in patent document 1 has the following problems. When the governor is operated, there are the following phenomena: when the elevator car descends at an excessive speed, the movable grip (latch weight) falls and the rope on the descending side is restrained by the fixed shoe (contact plate), and the rope falls off from the governor sheave (hereinafter also referred to as "sheave") (hereinafter also referred to as "falling-off phenomenon").

In this drop-out phenomenon, the lifting rope on the rising side opposite to the sheave floats due to its own inertial force when the governor is operated. Thus, the slings will be far from the pulleys. Such a phenomenon that the rope falls off the sheave is likely to occur remarkably when the height of the hoistway is increased and the weight of the rope is large, or when the rated speed of the elevator is large and the predetermined speed at which the governor operates is large.

In this case, since the inertial force of the rope becomes very large, the rope on the rising side jumps sharply, and the rope falls off the sheave. In this case, a large amount of labor is required for recovery of such a situation. In order to avoid this, shape improvement such as deepening the groove of the pulley or enlarging the flange in the radial direction has inevitable restrictions on the form of the pulley formed by casting, and is not practical. In order to prevent such a slip-off phenomenon, a structure is known in which a governor rope slip-off prevention cover (hereinafter also referred to as a "rope slip-off prevention cover") is provided on a sheave.

Further, patent document 2 describes an elevator governor in order to prevent a rope from jumping sharply, the elevator governor including: the present invention relates to a rope hooking device for an elevator, and more particularly, to a rope hooking device for an elevator, which includes a first rope hooking device for restricting a governor rope on a descending side when a descending speed of an elevator car or a counterweight exceeds a speed limit, and a second rope hooking device for further restricting a governor rope on an ascending side.

That is, the operating levers forming the first sling hook and the second sling hook are supported by the rotating shaft in the middle of one lever, and the operating levers moving up and down in opposite directions form the first sling hook and the second sling hook. The first sling wire hooking head is made heavier than the second sling wire hooking head in advance, or the operating lever is lengthened. Further, a pressing spring for generating a holding force of the governor rope is fitted in advance. As described above, in the elevator governor of patent document 2, when the elevator car or the counterweight is overspeed, both the descending side and the ascending side of the governor rope are restrained and held by the first rope hook and the second rope hook at the same time.

Prior art documents

Patent document

Patent document 1: WO2017/130264

Patent document 2: japanese laid-open patent publication No. 7-76471

However, the elevator governor of patent document 2 is configured to restrain and hold both the descending side and the ascending side of the governor rope by the first rope shackle and the second rope shackle simultaneously when the elevator car or the counterweight is overspeed. Therefore, the hook device for a suspension cable provided with two sets of hook devices has a disadvantage of a complicated structure. Further, in order to effectively function the "rope fall-off prevention cover", it is necessary to design the shape of the sheave in consideration of the diameter (thickness) of the governor rope, and therefore, it is difficult to adapt to sheaves having slightly different diameters, which is a problem of poor versatility.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide an elevator governor that is simple and versatile as possible without complicating the structure and is easy to be retrofitted in post-installation in order to prevent a governor rope from falling off a governor sheave and to ensure a normal holding operation of the governor rope.

Means for solving the problems

The present invention has been made to solve the above problems, and an object of the present invention is to provide an elevator governor capable of braking by sandwiching a governor rope between a movable gripping member and a fixed shoe when the lowering speed of an elevator car reaches a predetermined overspeed, wherein side walls are disposed on the upper half circumference of a governor sheave so as to face the governor rope.

Effects of the invention

According to the present invention, in order to prevent the governor rope from falling off the governor sheave and ensure a normal holding operation of the governor rope, it is possible to provide an elevator governor that is simple and versatile as possible without complicating the structure and is easy to be retrofitted in post-installation.

Drawings

Fig. 1 is a schematic configuration diagram of an elevator to which an elevator governor according to an embodiment of the present invention is applied.

Fig. 2 is a front view showing a specific structure of the elevator governor shown in fig. 1.

Fig. 3 is a side view of the elevator governor shown in fig. 2.

Description of reference numerals:

3 Elevator cage

7 elevator speed regulator

8 speed regulator pulley

10 speed regulator sling

25 fixed boots

26 Movable holding element (latch weight)

49 sidewalls.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the elevator governor according to the embodiment of the present invention may be simply referred to as a governor.

Fig. 1 is a schematic configuration diagram of an elevator to which a governor according to an embodiment of the present invention is applied. As shown in fig. 1, the elevator has a hoist installed at an upper portion of a hoistway, an elevator car 3 is connected to one end portion of a main hoist rope 2 wound around a traction sheave 1 of the hoist, and a counter weight 4 is connected to the other end portion of the main hoist rope 2. The elevator car 3 is configured to be movable up and down along a pair of

guide rails

5A, 5B provided in the hoistway, and the counterweight 4 is configured to be movable up and down along another pair of

guide rails

6A, 6B provided in the hoistway.

The governor 7 has a structure in which a governor rope 10 is looped around a governor sheave 8 disposed at an upper portion of the ascending/descending path and a tension governor sheave 9 disposed at a lower side of the ascending/descending path. An emergency brake 12 is disposed at the lower part of the elevator car 3, one end of an operating lever 11 attached to the elevator car 3 is connected to the operating body side of the emergency brake 12, and a suspension cable 10 is connected to the other end of the operating lever 11.

The governor 7 is configured to operate the emergency brake 7 via an operation lever 11 provided to the elevator car 3 when the descent speed of the elevator car 3 reaches a predetermined overspeed (for example, a speed not exceeding 1.4 times the rated speed), thereby mechanically stopping the elevator car 3 in an emergency. The governor 7 shown in fig. 1 will be described in more detail with reference to fig. 2 and 3.

Fig. 2 is a front view showing a specific structure of the speed governor 7 shown in fig. 1. Fig. 3 is a side view of the governor 7 shown in fig. 2. As shown in fig. 2 and 3, the pulley 8 is rotatably supported by a support shaft 14, and the support shaft 14 is fixed to bearing

brackets

22 and 23 on a frame 30. As described above, since the suspension rope 10 is connected to one end of the operating lever 11 attached to the elevator car 3, when the suspension rope 10 moves together with the elevator car 3, the sheave 8 rotates about the support shaft 14.

As shown in fig. 2, the governor rope drop prevention cover 40 is bolted to the frame 30 around the half of the upper side of the sheave 8 around the support shaft 14. The fall-off preventive cover 40 is fixed to the frame 30 by bolting the three divided blocking members 41 to 43 one by one, and then also to each other by bolting. As a result, the fall-off prevention cover 40 is substantially integrated, and therefore, the firmness can be improved.

The fall-off preventive cover 40 is assembled by coupling the three divided blocking members 41 to 43 to the

bearing brackets

22 and 23 or the frame 30 as a base thereof. The blocking members 41 to 43 divided into three parts have

long holes

41a, 42a, 43a capable of individually fine-adjusting the mounting positions.

The blocking members 41 to 43 divided into three parts are arranged in an array with reference to a three point P, Q, R, and the three point P, Q, R is positioned at equal intervals in two directions along the outer periphery of the pulley 8 centering on the uppermost point Q in the outer periphery of the pulley 8. Thus, the three points P, Q, R serve as the falling-off prevention portions having the falling-off prevention function, and are arranged so that the distance between the falling-off prevention portions P, Q, R is uniform, thereby effectively preventing the suspension cable 10 from falling off. This can most effectively prevent the rope 10 from jumping sharply on the rising side and falling off the sheave 8.

When the elongated hole 43a is bolted to the uppermost part of the frame 30 or in the vicinity thereof, the closing member 43 is closest to the outer periphery of the pulley 8 at one point Q, and therefore, positioning of 3/4 for controlling the clearance to the diameter (thickness) of the hoist rope 10 is relatively easy. In this positioning, the

long holes

41a, 42a, and 43a, which can be individually fine-adjusted in mounting position, are effective.

Similarly, when the elongated hole 41a is bolted to the upper left portion of the frame 30, the blocking member 41 can be positioned while being closest to the outer periphery of the pulley 8 at the point P. When the elongated hole 42a is bolted to the upper right portion of the frame 30, the blocking member 42 can also be positioned at the point R closest to the outer periphery of the pulley 8.

When the frame 30 is bolted while the blocking members 41 to 43 are positioned one by one in this manner, the long hole 41b bored in the upper portion of the blocking member 41 and the long hole 43b bored in the upper portion of the blocking member 43 are then coupled by bolting. Similarly, the long hole 42b bored in the upper portion of the closing member 42 and the long hole 43b bored in the upper portion of the closing member 43 are coupled by bolt fixation. As shown in fig. 3, a side wall 49 is formed on the vertical surface inside the sling falling prevention cover 40.

The side wall 49 is surrounded by an inner space width U, V narrower than the maximum outer width W of the bearing

brackets

22 and 23 pivotally supported by the pulley 8 in the axial direction X. That is, in the governor 7, the side walls 49 are disposed opposite to each other at positions facing the hoist rope 10 on the upper half circumference of the sheave 8. The side wall 49 is configured to prevent the fall of the suspension cable 10 by eliminating the fall space in the axial direction X.

The rope fall-off prevention cover 40 is formed by integrally assembling and connecting the closing members 41 to 43 on the upper half circumference of the pulley 8. This has an effect of blocking the escape where the suspension cable 10 is to be radially detached from the support shaft 14 on the outer periphery of the pulley 8, not only in the axial direction X. As a result, the falling-off prevention effect of the suspension rope 10 can be further improved.

Returning to fig. 2, arms 17 extending to both sides of support shaft 14 and rotating together with pulley 8 are provided on the outer periphery of support shaft 14 of pulley 8, and

rotating shafts

33, 34 having substantially arc-shaped

vibrators

15, 16 are rotatably coupled to both ends of arm 17. The position of the rotating shaft 33 in the vibrating member 15 is shifted, and one end 15a is heavier than the other end 15 b. The arm 17 is referred to as a spoke shape in view of its impression, but is not necessarily a rod-like arm.

Similarly, the position of the rotation shaft 34 in the oscillator 16 is also shifted, and the oscillator has one end 16a and the other end 16b, and the one end 16a is heavier than the other end 16 b. When the arm 17 rotates together with the pulley 8, the

vibrators

15 and 16 also rotate together, and the one

end portions

15a and 16a of the

vibrators

15 and 16 are subjected to centrifugal force and rotate via the rotating

shafts

33 and 34 so as to be separated from the support shaft 14 from the

other end portions

15b and 16 b.

A speed adjustment spring 18 is disposed on the side of the oscillator 16 closer to the one end 16a, and the speed adjustment spring 18 limits the amount of displacement of the one end 16a in the direction away from the support shaft 14. The speed adjustment spring 18 is disposed at a position close to a portion of the arm 17 and the other end 15b of the oscillator 15.

Therefore, when the centrifugal force acting on the

vibrators

15, 16 exceeds the resistance of the speed adjusting spring 18, the speed adjusting spring 18 is elastically deformed, and the

vibrators

15, 16 rotate about the rotating

shafts

33, 34 as the connecting portions with the arms 17. Further, since the oscillator 15 and the oscillator 16 are interlocked with each other at predetermined radial positions from the

respective rotation shafts

33 and 34 by the coupling rod 19, the rotation angles of the two elements are matched.

Further, a claw portion 20 protruding opposite to the rotation shaft 34 of the oscillator 16 is formed at the other end portion 16b of the oscillator 16. When the

vibrators

15, 16 are rotated about the

rotation shafts

33, 34 by centrifugal force and the other end 16b of the vibrator 16 is displaced in a direction approaching the support shaft 14, the pawl 20 engages with a tooth 21a of a ratchet 21 described later.

The ratchet 21 rotatably supported by the support shaft 14 is formed in a substantially disk shape, and one plane thereof faces the

vibrators

15, 16. A plurality of teeth 21a are formed discretely on the outer peripheral surface of the ratchet 21. When the oscillator 16 rotates and the one end 16a expands outward due to centrifugal force, the other end 16b moves inward, and the pawl 20 of the oscillator 16 engages with the tooth 21a of the ratchet 21. The shoe mechanism 24 that operates at the time of this engagement is configured to include a fixed shoe 25, a movable grip element 26 such as a lock weight, a lever 27, a grip spring 28, a hook 29, and the like.

The fixing shoe 25 is fixed to the frame 30 and faces one side of the sling 10. On the other hand, the movable grip element 26 disposed on the other side of the suspension cable 10 is rotatably attached to one axial end of the rod 27. The free end side of the movable gripping element 26 can be sandwiched from the other side of the sling 10 and disposed to face the fixed shoe 25.

Further, a spring seat 32 is provided on one end side of the rod 27 to which the movable grip element 26 is attached. The other end in the axial direction of the rod 27 is supported on the frame 30 via a fixing plate 31. Further, a rod 27 is inserted into the grip spring 28 disposed between the fixed plate 31 and the spring seat 32. The spring seat 32 is a free end side of both ends of the grip spring 28.

Therefore, the grip spring 28 as a compression spring biases the movable grip element 26 toward the fixed shoe 25 via the spring seat 32 of the rod 27. The hook 29 is rotatably supported by the frame 30 via a rotating shaft 35. The hook 29 has an arm 29a having one end extending in the direction of the ratchet 21. The arm portion 29a engages with a ratchet pin 21b provided on a side surface of the ratchet 21.

In a state where the ratchet 21 is not rotated, the engagement state of the arm portion 29a and the ratchet pin 21b is maintained, and the engagement state of the pin 26a and the hook portion 29b is also maintained. Therefore, the movable grip element 26 is held in a state of having an inclination as shown in fig. 2, and its free end portion is away from the fixed shoe 25.

As described later, the movable gripping element 26 is a member that releases the normal support-locked state by the overspeed detection function when the descent speed of the elevator car 3 reaches a predetermined overspeed. As a result, the safety mechanism actuates the emergency brake. Next, the safety operation of the governor 7 will be described.

In a normal state, for example, when the elevator car 3 descends, the rope 10 also moves in the same direction as the elevator car 3 and rotates the sheave 8. Thereby, centrifugal force acts on the vibrating

members

15, 16. When the descending speed of the elevator car 3 reaches a predetermined overspeed, if the centrifugal force of the vibrating

elements

15 and 16 exceeds the resistance of the speed adjusting spring 18, the vibrating

elements

15 and 16 rotate about the rotating

shafts

33 and 34.

The state in which the governor 7 is operated to hold the hoist rope 10 will be simply described without illustration. When the lowering speed of the elevator car 3 reaches a predetermined overspeed, the pawl 20 provided at the other end 16b of the rotating oscillator 16 engages with the tooth 21a of the ratchet 21, and the ratchet 21 is rotated counterclockwise in fig. 2. When the ratchet 21 rotates in this way, the hook 29 rotates clockwise about the rotation shaft 35 via the ratchet pin 21 b.

Accordingly, the hook portion 29b is disengaged from the movable grip element pin 26a, the free end side of the movable grip element 26 falls by its own weight, and the fixed shoe 25 faces the movable grip element 26 and sandwiches the suspension wire 10. In this state, since the movable grip element 26 is biased toward the fixed shoe 25 by the grip spring 28, the hoist rope 10 is held between the movable grip element 26 and the fixed shoe 25 and braked. As a result, in fig. 1, the elevator car 3 continues to descend while the movement of the suspension rope 10 is stopped, and as a result, the operating lever 11 connected to the suspension rope 10 is lifted up, the emergency brake 12 is operated, and the elevator car 3 is mechanically brought to an emergency stop.

Thus, the governor 7 operates to grip the hoist rope 10 between the fixed shoe 25 and the movable gripping member 26. At this time, the grip spring 28 biases the movable grip element 26 toward the fixed shoe 25 via the spring seat 32 of the rod 27, and the movable grip element 26 is pressed toward the fixed shoe 25 while the movable grip element 26 and the rod 27 are held in a substantially linear state.

As described above, the governor 7 brakes the rope 10 by being sandwiched between the movable gripping element 26 such as a lock weight and the fixed shoe 25 when the lowering speed of the elevator car 3 reaches a predetermined overspeed, and the side wall 49 is provided on the upper half circumference of the sheave 8 so as to face the rope 10.

The governor 7 having such a structure has an effect that the side wall 49 blocks the escape position of the hoist rope 10 coming off the sheave 8 in the axial direction X. That is, when the rope 10 suddenly jumps near the rising point R shown by the arrow in fig. 2, it falls off the pulley 8, but is stopped by the portion indicated by the reference numeral 42R of the closing member 42. As a result, the hoist rope 10 can be prevented from falling off the pulley 8.

The blocking

members

43 and 41 may be disposed continuously with the blocking member 42 so as to surround the upper half of the pulley 8. These blocking members 41 to 43 form a substantially integrated sling fall-off prevention cover 40, and provide an excellent effect of blocking the escape of the falling sling 10.

The elevator governor 7 according to the embodiment of the present invention can be summarized as follows.

[1] The elevator governor 7 is configured to operate a safety mechanism of an elevator by sandwiching the hoist rope 10 between the movable gripping member 26 and the fixed shoe 25 to brake when the lowering speed of the elevator car 3 reaches a predetermined overspeed.

In the governor 7, a side wall 49 is disposed opposite to a position facing the hoist rope 10 on an upper half circumference of the sheave 8. In the case where the side wall 49 is not used, in order to prevent the rope from falling off, there is a limitation inherent to the casting forming the governor sheave in the improvement measures of the shape deformation of the governor sheave such as the groove being deepened or the flange being enlarged in the radial direction, and this is not practical.

According to the governor 7, the side walls 49 arranged to face the slings 10 in the upper half circumference of the sheave 8 have an effect of blocking the retreated portions of the slings 10 which fall off from the sheave 8 in the axial direction X. As a result, the rope 10 is prevented from falling off the pulley 8, and a normal holding operation of the rope 10 is ensured. Therefore, the side wall 49 of the governor 7 is as simple and versatile as possible without being complicated. In addition, the modification of the side wall 49 by post-installation is easy in the conventional elevator governor as well as in most elevator governors.

[2] In the above [1], the side wall 49 is surrounded by the internal space width U, V narrower than the maximum outer width W of the bearing

brackets

22 and 23 pivotally supported by the pulley 8 with respect to the axial direction X. In other words, the side surface of the rope fall-off prevention cover 40 has a width V smaller than the width W of the governor 7 main body. This eliminates the space for the fall in the axial direction X, thereby further improving the fall prevention effect of the suspension cable 10.

[3] In the above [2], the side wall 49 is provided with the blocking members 41 to 43, and the blocking members 41 to 43 form the rope fall-off prevention cover 40 on the upper half circumference of the pulley 8. This has an effect of blocking the escape where the suspension cable 10 is to be radially detached from the support shaft 14 on the outer periphery of the pulley 8, not only in the axial direction X. As a result, the falling-off prevention effect of the suspension rope 10 can be further improved.

[4] In the above [3], the fall-off preventive cover 40 is assembled by coupling the three-divided blocking members 41 to 43 to the bearing

brackets

22 and 23, and the three-divided blocking members 41 to 43 are provided with

elongated holes

41a, 42a, and 43a that allow fine adjustment of the mounting positions individually.

In the conventional governor, it is necessary to adjust the position of the gap between the surface of the hoist rope 10 wound around the outer periphery of the pulley 8 and the hoist rope fall-off prevention cover covering the surface to 3/4 with respect to the diameter of the hoist rope 10. Therefore, the sling fall-off prevention cover that covers the half-circumference portion of the pulley 8 in an integral structure is not only accompanied by difficulty in positioning adjustment but also lacks versatility.

Therefore, in the conventional governor, if the diameters of the pulleys 8 are slightly different, a dedicated rope fall-off prevention cover needs to be prepared to be suitable for this, and if the positioning adjustment is not accurate, the fall-off prevention effect of the rope 10 cannot be obtained satisfactorily. This situation becomes a major factor in cost increase.

In contrast, according to the governor 7 of [4], the rope fall-off prevention cover 40 is assembled by joining the three divided blocking members 41 to 43. The blocking members 41 to 43 divided into three parts can be individually adjusted in mounting position by the

elongated holes

41a, 42a, and 43 a. As a result, positioning adjustment at the time of completion of assembly is facilitated, versatility is also improved, and the present invention is also applicable to post-installation modification work.

[5] In the above item [4], the blocking members 41 to 43 divided into three parts are configured to couple the covers to each other. Thus, when the three-divided blocking members 41 to 43 are assembled, the covers can be joined to each other to be strengthened after the mounting positions are individually adjusted.

[6] In the above [4], the blocking members 41 to 43 divided into three parts are arranged in line with reference to a three point P, Q, R, and the three point P, Q, R is positioned at equal intervals in two directions along the outer periphery around the uppermost point Q in the outer periphery of the pulley 8. This most effectively prevents the hoist rope 10 from jumping sharply and falling off the pulley 8 on the rising side in the rotation direction, particularly in the order of point R, Q, P in fig. 2.

The side walls 49 disposed opposite to each other at positions facing the slings 10 are defined by the above-mentioned items [1] and [2 ]. Further, the slinging fall-off preventive cover 40 including the side wall 49 is defined in the above-mentioned [3] to [6 ]. Further, the following [7] specifies more specifically a structure for realizing the speed governor 7.

[7] In any of the above [1] to [6], the governor 7 may be configured to include the hoist rope 10, the pulley 8, the

vibrators

15, 16, the movable gripping element 26, and the hook portion 29. The suspension rope 10 is connected to the elevator car 3. A rope 10 is wound around the pulley 8.

The vibrating

members

15 and 16 are expanded radially outward of the pulley 8 by a centrifugal force corresponding to the rotational speed of the pulley 8. The movable gripping element 26 is configured to be rotatable about the connecting portion 37 and grip the sling 10. The hook portion 29 supports the movable grip element 26 by engaging with the movable grip element 26, and releases the support of the movable grip element 26 by rotating about the rotating shaft 35.

In the governor 7, when the elevator car 3 is at an emergency stop speed exceeding a predetermined speed, the vibrating

members

15 and 16 spread outward in the radial direction of the sheave 8. The

vibrators

15, 16 operate the hook 29 by the expanding operation. The hook 29 that operates on the

vibrators

15, 16 releases the support of the movable grip element 26 by the hook 29. As a result, the safety mechanism operates the emergency brake 12 by detecting an abnormal situation detected by the governor 7, that is, by detecting that the descending speed of the elevator car 3 exceeds a predetermined speed. Such a governor 7 is suitable for an existing elevator, and therefore, is also suitable for post-installation reconstruction.

The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above embodiments have been described in detail to facilitate understanding of the present invention, but the present invention is not necessarily limited to having all of the described configurations. Further, a part of the structure of one embodiment may be replaced with the structure of another embodiment, or the structure of one embodiment may be added to the structure of another embodiment. Further, some of the configurations of the embodiments may be added with other configurations, deleted, or replaced.

Claims

1. A speed governor for an elevator, in which a speed governor rope is sandwiched between a movable holding member and a fixed shoe to be braked when the lowering speed of an elevator car reaches a predetermined overspeed,

side walls are arranged on the upper half circumference of the governor sheave and opposite to the position facing the governor sling,

the side wall is surrounded by an inner space width narrower than a maximum outer shape width with respect to an axial direction of a bearing bracket that supports the governor sheave by a shaft,

the side wall is provided with a blocking component which forms a governor sling falling-off prevention cover on the upper half circumference of the governor pulley,

the governor sling falling prevention cover is assembled by combining a blocking member divided into three parts with a bearing bracket, the blocking member divided into three parts is provided with a long hole capable of independently performing fine adjustment on the installation position,

the governor rope drop-off prevention cover is formed by assembling and coupling the blocking member divided into three parts integrally on the upper half circumference of the governor sheave.

2. The elevator governor of claim 1, wherein,

the blocking member divided into three parts is configured to couple covers to each other.

3. The elevator governor of claim 1, wherein,

the blocking member divided into three parts is arranged in an array with reference to three points positioned at equal intervals in two directions along the outer periphery of the governor sheave, with a center at a point positioned uppermost in the outer periphery of the governor sheave.

4. The elevator governor of any of claims 1-3, wherein,

the governor rope is coupled to the elevator car,

the elevator speed governor has:

the governor sheave around which the governor rope is wound;

a vibration member that spreads toward a radial outside of the governor sheave by a centrifugal force according to a rotation speed of the governor sheave;

a movable gripping element that grips the governor rope; and

a hook portion configured to be rotatable about a rotation axis, support the movable gripping element by engaging with the movable gripping element, and release the support of the movable gripping element by rotating about the rotation axis,

the vibrator is expanded radially outward of the governor sheave, and the hook portion is operated at the predetermined overspeed of the elevator car, and the support of the movable gripping member by the hook portion is released.