Elevator governor

Abstract

To provide an elevator governor whose balancing spring can be easily replaced.SOLUTION: In an elevator governor, a spring mounting portion 652 is fixed to a governor sheave 65. A support main body 671 is connected to a centrifugal weight 66 and is displaceably provided with respect to the spring mounting portion 652. A retaining member 672 is detachably attached to the support main body 671 and prevents the support main body 671 from disengaging from the spring mounting portion 652 by engaging with the spring mounting portion 652. A balance spring 68 is provided on the support main body 671, and when the retaining member 672 is removed from the support main body 671, the balance spring 68 becomes removable from the support main body 671.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an elevator governor. [Background technology]

[0002] Patent Document 1 discloses an elevator governor that has a flyweight attached to a governor sheave that rotates in conjunction with the movement of the car, and detects excessive car speed based on the displacement of the flyweight due to centrifugal force caused by the rotation of the governor sheave. The displacement of the flyweight due to centrifugal force is adjusted by a speed adjustment spring. The speed adjustment spring is supported by a spring support member connected to the flyweight and the governor sheave. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-1822 Summary of the Invention [Problem to be solved by the invention]

[0004] Typical elevator governors use speed adjustment springs with different performance depending on the elevator's specifications, which means that different governors must be stocked for each elevator depending on its specifications.

[0005] To reduce the number of elevator governors in stock, it is possible to replace the speed adjustment spring built into the finished governor with a different speed adjustment spring with different performance. However, the structure of the conventional elevator governor disclosed in Patent Document 1 is such that the spring support member that supports the speed adjustment spring cannot be removed from the governor sheave. Therefore, with conventional elevator governors, the governor must be disassembled to replace the speed adjustment spring, making the process of replacing the speed adjustment spring time-consuming.

[0006] The present disclosure is intended to solve the above-mentioned problems, and has an object to provide an elevator governor in which the balance spring can be easily replaced. [Means for solving the problem]

[0007] The elevator governor according to the present disclosure includes a governor sheave that rotates in response to the movement of an elevating body, a centrifugal weight that is attached to the governor sheave and displaces relative to the governor sheave by receiving centrifugal force accompanying the rotation of the governor sheave, a spring support member that displaces relative to the governor sheave in response to the displacement of the centrifugal weight relative to the governor sheave, and a balancing spring that generates an elastic restoring force that opposes the centrifugal force in response to the displacement of the spring support member relative to the governor sheave, and a spring mounting portion is fixed to the governor sheave, and the spring support member is a support member. The support body has a body part and an anti-detachment member, the support body part is connected to the centrifugal weight and is displaceably attached to the spring mounting part, the anti-detachment member is detachably attached to the support body part and prevents the support body part from coming off the spring mounting part by engaging with the spring mounting part, the balance spring is attached to the support body part and the spring mounting part receives the balance spring, and by removing the anti-detachment member from the support body part, the balance spring becomes detachable from the support body part. [Effects of the Invention]

[0008] According to the elevator governor of the present disclosure, the balance spring can be easily replaced. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a configuration diagram showing an elevator according to a first embodiment. [Figure 2] FIG. 2 is a front view showing the speed governor of FIG. 1. [Figure 3] FIG. 3 is a front view showing the interlocking mechanism part of FIG. 2. [Figure 4] 4 is an enlarged view showing a state in which the stopper member of FIG. 3 is attached to the end of the connecting rod on the sheave side. FIG. [Figure 5]5 is a perspective view showing the sheave side end of the connecting rod in FIG. 4. FIG. [Figure 6] FIG. 5 is a perspective view showing the retaining member of FIG. 4. [Figure 7] FIG. 10 is a front view showing an interlocking mechanism of a speed governor according to a second embodiment. [Figure 8] FIG. 11 is a front view showing an interlocking mechanism of a speed governor according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following describes embodiments of the subject matter of the present disclosure with reference to the accompanying drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals, and redundant explanations are appropriately simplified or omitted. Note that the subject matter of the present disclosure is not limited to the following embodiments, and any component of the embodiments may be modified or omitted within the scope of the gist of the present disclosure.

[0011] Embodiment 1 Figure 1 is a configuration diagram showing an elevator according to embodiment 1. In the figure, a machine room 2 is provided above an elevator shaft 1. The machine room 2 is provided with a hoisting machine 3, a deflector sheave 4, a control device 5, and a governor 6.

[0012] The hoisting machine 3 has a drive sheave 31. The drive sheave 31 is rotated by the driving force of the motor in the hoisting machine 3.

[0013] A suspension body 7 is wound around the drive sheave 31 and the deflector sheave 4. A plurality of ropes or a plurality of belts is used as the suspension body 7. One end of the suspension body 7 is connected to a car 8 as a lifting body. The other end of the suspension body 7 is connected to a counterweight 9 as a lifting body. The car 8 and counterweight 9 are suspended within the hoistway 1 by the suspension body 7.

[0014] The car 8 and counterweight 9 move up and down within the hoistway 1 in accordance with the rotation of the drive sheave 31. The control device 5 controls the hoisting machine 3 to move the car 8 and counterweight 9 up and down. The movement of the car 8 is guided by a pair of car guide rails 10 installed within the hoistway 1. The movement of the counterweight 9 is guided by a pair of counterweight guide rails 11 installed within the hoistway 1. A car buffer 12 and a counterweight buffer 13 are installed at the bottom of the hoistway 1.

[0015] An emergency stop device 14 is provided at the bottom of the car 8. An operating lever 15 is provided on the emergency stop device 14. The emergency stop device 14 is activated by operating the operating lever 15. When the emergency stop device 14 is activated while the car 8 is moving, the emergency stop device 14 grips the pair of car guide rails 10 to bring the car 8 to an emergency stop.

[0016] A governor rope 16 is wound around the governor 6. A tension wheel 17 is arranged at the bottom of the elevator shaft 1. The governor rope 16 is wound around the tension wheel 17. Both ends of the governor rope 16 are connected to an operating lever 15. As a result, the governor rope 16 is stretched in a loop between the governor 6 and the tension wheel 17. The governor rope 16 moves in accordance with the movement of the car 8.

[0017] The governor 6 is capable of gripping the governor rope 16. When the governor 6 grips the governor rope 16 while the car 8 is moving downward, the movement of the governor rope 16 stops and the operating lever 15 is operated by the governor rope 16. This activates the emergency stop device 14, and the car 8 comes to an emergency stop.

[0018] Fig. 2 is a front view showing the governor 6 of Fig. 1. The governor 6 has a governor base 61, an interlocking mechanism 62, a detection switch 63, and a gripping mechanism 64. The interlocking mechanism 62, the detection switch 63, and the gripping mechanism 64 are supported by the governor base 61.

[0019] Fig. 3 is a front view showing the interlocking mechanism 62 of Fig. 2. The interlocking mechanism 62 is a mechanism that is interlocked with the movement of the governor rope 16. The interlocking mechanism 62 has a governor sheave 65, a pair of centrifugal weights 66, a spring support member 67, and a balance spring 68.

[0020] A sheave shaft 651 is provided horizontally on the governor base 61. A governor sheave 65 is supported on the governor base 61 via a sheave shaft 621. A governor rope 16 is wound around the governor sheave 65. The governor sheave 65 rotates relative to the governor base 61 around the sheave shaft 651 in accordance with the movement of the car 8 and the governor rope 16. As a result, the rotation speed of the governor sheave 65 corresponds to the movement speed of the car 8.

[0021] The governor sheave 65 is provided with a pair of weight shafts 661. Each weight shaft 661 is arranged parallel to the sheave shaft 651. A centrifugal weight 66 is individually attached to each weight shaft 661. Each centrifugal weight 66 is rotatable about the weight shaft 661. Each centrifugal weight 66 is displaced relative to the governor sheave 65 by rotating about the weight shaft 661.

[0022] When the governor sheave 65 rotates, each centrifugal weight 66 is subjected to centrifugal force associated with the rotation of the governor sheave 65. Each centrifugal weight 66 rotates around the weight shaft 661 by receiving the centrifugal force associated with the rotation of the governor sheave 65. In other words, each centrifugal weight 66 is displaced relative to the governor sheave 65 by receiving the centrifugal force associated with the rotation of the governor sheave 65.

[0023] The pair of centrifugal weights 66 are connected to each other via a link 662. As a result, the pair of centrifugal weights 66 are displaced relative to the governor sheave 65 while interlocking with each other via the link 662.

[0024] The magnitude of the centrifugal force that each centrifugal weight 66 receives depends on the rotation speed of the governor sheave 65 and the moving speed of the car 8. The amount of displacement of each centrifugal weight 66 relative to the governor sheave 65 depends on the magnitude of the centrifugal force that each centrifugal weight 66 receives.

[0025] A spring mounting portion 652 is fixed to the governor sheave 65. The spring mounting portion 652 is a plate-shaped portion arranged along the radial direction of the governor sheave 65. A through hole 653 is provided in the spring mounting portion 652.

[0026] The spring support member 67 has a support body portion 671 and a stopper member 672 .

[0027] The support main body portion 671 is connected to one of the centrifugal weights 66 and is displaceably provided on the spring mounting portion 652. As a result, the spring support member 67 is displaced relative to the governor sheave 65 in accordance with the displacement of the one of the centrifugal weights 66 relative to the governor sheave 65.

[0028] The support body 671 has a connecting rod 673 , a spring receiving portion 674 , and a position adjusting nut 675 .

[0029] The connecting rod 673 has a weight-side end portion 673a, a sheave-side end portion 673b, and an intermediate portion 673c. The intermediate portion 673c is a portion of the connecting rod 673 located between the weight-side end portion 673a and the sheave-side end portion 673b.

[0030] The weight-side end 673a of the connecting rod 673 is rotatably connected to one of the centrifugal weights 66. The middle portion 673c of the connecting rod 673 is passed through the through hole 653. The sheave-side end 673b of the connecting rod 673 is located on the opposite side of the spring mounting portion 652 from the one of the centrifugal weights 66. As a result, the connecting rod 673 passes through the through hole 653 of the spring mounting portion 652 from the one of the centrifugal weights 66 and protrudes from the spring mounting portion 652. The connecting rod 673 is displaced relative to the spring mounting portion 652 while sliding through the through hole 653 in accordance with the displacement of the one of the centrifugal weights 66 relative to the governor sheave 65.

[0031] The spring bearing portion 674 is attached to the middle portion 673c of the connecting rod 673. The spring bearing portion 674 is disposed at a position between the spring mounting portion 652 and one of the centrifugal weights 66. As a result, when the one of the centrifugal weights 66 receives centrifugal force due to the rotation of the governor sheave 65 and is displaced relative to the governor sheave 65, the spring support member 67 is displaced relative to the governor sheave 65 in a direction in which the spring bearing portion 674 approaches the spring mounting portion 652.

[0032] The position of the spring receiving portion 674 relative to the connecting rod 673 can be adjusted in the longitudinal direction of the connecting rod 673 by a position adjustment nut 675. At least a portion of the middle portion 673c of the connecting rod 673 is a threaded portion. The position adjustment nut 675 is attached to the threaded portion of the middle portion 673c. The position adjustment nut 675 is positioned closer to one of the centrifugal weights 66 than the spring receiving portion 674. The position of the spring receiving portion 674 relative to the connecting rod 673 is adjusted by turning the position adjustment nut 675.

[0033] The stopper member 672 is detachably attached to the support body 671. Specifically, the stopper member 672 is detachably attached to the sheave side end 673b of the connecting rod 673.

[0034] The anti-detachment member 672 is located on the opposite side of the spring mounting portion 652 from the one centrifugal weight 66. In other words, the anti-detachment member 672 is located farther from the one centrifugal weight 66 than the spring mounting portion 652. As a result, when the one centrifugal weight 66 is displaced relative to the governor sheave 65 due to the centrifugal force caused by the rotation of the governor sheave 65, the spring support member 67 is displaced relative to the governor sheave 65 in a direction that moves the anti-detachment member 672 away from the spring mounting portion 652.

[0035] When the anti-detachment member 672 is viewed along the longitudinal direction of the connecting rod 673, part of the area of ​​the anti-detachment member 672 protrudes from the area of ​​the through-hole 653. The size of the anti-detachment member 672 is such that it cannot pass through the through-hole 653. As a result, the anti-detachment member 672 engages with the spring mounting portion 652, preventing the connecting rod 673 from coming off the through-hole 653. In other words, the anti-detachment member 672 engages with the spring mounting portion 652, thereby preventing the support main body portion 671 from coming off the spring mounting portion 652. When the anti-detachment member 672 is engaged with the spring mounting portion 652, the support main body portion 671 is connected to the spring mounting portion 652.

[0036] In the spring support member 67, when the anti-detachment member 672 is detached from the connecting rod 673, the connecting rod 673 is allowed to come out of the through-hole 653. Therefore, when the anti-detachment member 672 is detached from the support main body part 671, the support main body part 671 becomes detachable from the spring attachment part 652.

[0037] Here, FIG. 4 is an enlarged view showing a state in which the anti-detachment member 672 of FIG. 3 is attached to the sheave-side end 673b of the connecting rod 673. FIG. 5 is a perspective view showing the sheave-side end 673b of the connecting rod 673 of FIG. 4. FIG. 6 is a perspective view showing the anti-detachment member 672 of FIG. 4. As shown in FIG. 5, the sheave-side end 673b of the connecting rod 673 is an attachment shaft along the longitudinal direction of the connecting rod 673. A protrusion 676 is provided on the outer peripheral surface of the sheave-side end 673b. The outer diameter of the sheave-side end 673b is smaller than the outer diameter of the intermediate portion 673c. As a result, a step 673d is formed along the circumferential direction of the connecting rod 673 at the boundary between the intermediate portion 673c and the sheave-side end 673b.

[0038] As shown in Fig. 6, the anti-detachment member 672 is a cylindrical member. The outer diameter of the anti-detachment member 672 is larger than the inner diameter of the through-hole 653. The sheave-side end 673b is passed through the anti-detachment member 672 as shown in Fig. 4. Hereinafter, the direction in which the sheave-side end 673b, which is the mounting shaft, is passed through the anti-detachment member 672 will be referred to as the "shaft passing direction."

[0039] As shown in Fig. 4, the protrusion 676 is located closer to the tip of the sheave-side end 673b than the anti-detachment member 672. Therefore, the anti-detachment member 672 is located closer to the spring mounting portion 652 in the shaft insertion direction than the protrusion 676. The dimension of the anti-detachment member 672 in the shaft insertion direction is smaller than the spatial distance between the step 673d and the protrusion 676 in the shaft insertion direction. In this embodiment, the outer diameter of the middle portion 673c of the connecting rod 673 is larger than the inner diameter of the anti-detachment member 672. This prevents the anti-detachment member 672 from moving along the middle portion 673c by engaging with the step 673d.

[0040] As shown in Fig. 6, a groove 672a is provided on the inner peripheral surface of the anti-detachment member 672 along the shaft insertion direction. The groove 672a is open at both ends of the anti-detachment member 672 in the shaft insertion direction. The protrusion 676 is insertable into the groove 672a. This allows the anti-detachment member 672 to move in the shaft insertion direction relative to the sheave-side end 673b with the protrusion 676 inserted in the groove 672a.

[0041] When the anti-removal member 672 is positioned between the protrusion 676 and the step 673d, the anti-removal member 672 is rotatable in the circumferential direction of the anti-removal member 672 relative to the sheave-side end 673b. In the spring support member 67, the position of the groove 672a in the circumferential direction of the anti-removal member 672 is shifted from the position of the protrusion 676, so that the anti-removal member 672 engages with the protrusion 676 and is prevented from coming off the sheave-side end 673b. On the other hand, in the spring support member 67, the position of the groove 672a in the circumferential direction of the anti-removal member 672 coincides with the position of the protrusion 676, so that the protrusion 676 moves in the groove 672a, allowing the anti-removal member 672 to be removed from the sheave-side end 673b in the shaft insertion direction.

[0042] 6, a recess 672b is provided on the end face of the anti-removal member 672 facing away from the spring attachment portion 652, out of both end faces in the shaft insertion direction. The recess 672b is provided at a position different from the position of the groove 672a in the circumferential direction of the anti-removal member 672. In this embodiment, the position of the recess 672b is shifted by 180° in the circumferential direction of the anti-removal member 672 from the position of the groove 672a.

[0043] In the spring support member 67, at least a portion of the protrusion 676 fits into the recess 672b, thereby preventing the anti-detachment member 672 from rotating relative to the sheave-side end 673b. When the protrusion 676 is fitted into the recess 672b, a gap d1 is created between the anti-detachment member 672 and the step 673d. The depth d2 of the recess 672b in the shaft insertion direction is smaller than the gap d1.

[0044] As shown in Fig. 3, the balance spring 68 is a coil spring. The balance spring 68 is provided on the support main body 671 with a connecting rod 673 passing through the inside of the balance spring 68. This prevents the balance spring 68 from being removed from the support main body 671 while the support main body 671 is connected to the spring mounting portion 652. On the other hand, when the support main body 671 is detached from the spring mounting portion 652, the balance spring 68 can be removed from the support main body 671.

[0045] The balance spring 68 is elastically compressed between the spring mounting portion 652 and the spring bearing portion 674. As a result, the balance spring 68 generates an elastic restoring force in a direction that widens the gap between the spring mounting portion 652 and the spring bearing portion 674. The spring mounting portion 652 and the spring bearing portion 674 support the balance spring 68. In the initial state where the rotation of the governor sheave 65 has stopped, the elastic restoring force of the balance spring 68 causes the retaining member 672 to engage with the spring mounting portion 652, thereby maintaining a constant distance between the spring bearing portion 674 and the spring mounting portion 652.

[0046] When the spring support member 67 is displaced relative to the governor sheave 65 due to the centrifugal force generated by the rotation of the governor sheave 65, the spring retainer 672 moves away from the spring mounting portion 652, while the spring seat 674 moves closer to the spring mounting portion 652. As the spring seat 674 moves closer to the spring mounting portion 652, the balance spring 68 is further compressed, generating an elastic restoring force that counteracts the centrifugal force acting on the centrifugal weight 66. The elastic restoring force of the balance spring 68 that counteracts the centrifugal force increases as the centrifugal force increases. Therefore, the balance spring 68 generates an elastic restoring force that counteracts the centrifugal force acting on the centrifugal weight 66 in accordance with the displacement of the spring support member 67 relative to the governor sheave 65. In this way, when the governor sheave 65 is rotating, the centrifugal weight 66 is displaced relative to the governor sheave 65 while maintaining a balance between the centrifugal force acting on the centrifugal weight 66 and the elastic restoring force of the balancing spring 68 that opposes the centrifugal force.

[0047] An operating piece 663 is fixed to one of the centrifugal weights 66. The operating piece 663 protrudes outward from one of the centrifugal weights 66 in the radial direction of the governor sheave 65. When one of the centrifugal weights 66 is displaced relative to the governor sheave 65 by centrifugal force accompanying the rotation of the governor sheave 65, the operating piece 663 moves relative to the governor sheave 65 in a direction away from the sheave shaft 651.

[0048] As shown in Fig. 2, the detection switch 63 has a switch body 631 and a switch lever 632. The switch body 631 is attached to the speed governor base 61. The switch lever 632 protrudes from the switch body 631. When the switch lever 632 is operated, the switch body 631 outputs a stop signal to the control device 5. When the control device 5 receives the stop signal from the detection switch 63, it stops the supply of power to the hoisting machine 3 and activates the brake of the hoisting machine 3.

[0049] The tip of the switch lever 632 is disposed on the trajectory of the operating piece 663 when the speed of the car 8 reaches a set excessive speed that is higher than the normal speed. Therefore, when the speed of the car 8 reaches the set excessive speed, the switch lever 632 is operated by the operating piece 663.

[0050] When the speed of the car 8 reaches an emergency stop overspeed that is higher than the set overspeed, the amount of displacement of each centrifugal weight 66 relative to the governor sheave 65 becomes even greater than when the speed of the car 8 is at the set overspeed due to an increase in centrifugal force accompanying the rotation of the governor sheave 65. The gripping mechanism 64 is activated by the amount of displacement of the centrifugal weight 66 relative to the governor sheave 65 when the speed of the car 8 reaches the emergency stop overspeed. When the gripping mechanism 64 is activated, the gripping mechanism 64 grips the governor rope 16.

[0051] Next, the operation will be described. When the car 8 moves, the governor sheave 65 rotates about the sheave shaft 651 in accordance with the movement of the car 8. As a result, each centrifugal weight 66 receives a centrifugal force in accordance with the rotational speed of the governor sheave 65.

[0052] When the centrifugal force acting on each centrifugal weight 66 increases as the speed of the car 8 increases, each centrifugal weight 66 is displaced relative to the governor sheave 65 in a direction that compresses the balance spring 68. This causes the balance spring 68 to generate an elastic restoring force that opposes the centrifugal force, maintaining a balance between the centrifugal force acting on the centrifugal weight 66 and the elastic restoring force of the balance spring 68 that opposes the centrifugal force. Therefore, when the rotational speed of the governor sheave 65 increases and the centrifugal force acting on each centrifugal weight 66 increases, each centrifugal weight 66 is displaced relative to the governor sheave 65 in a direction that compresses the balance spring 68 in accordance with the increase in centrifugal force.

[0053] When the centrifugal weight 66 to which the operating piece 663 is fixed is displaced relative to the governor sheave 65 in a direction that compresses the balance spring 68, the operating piece 663 moves radially outward from the governor sheave 65. Therefore, when the rotational speed of the governor sheave 65 increases and the centrifugal force that each centrifugal weight 66 receives increases, the radius of the rotational orbit of the operating piece 663 increases.

[0054] For example, if the speed of the car 8 reaches a set excessive speed due to some abnormality while the car 8 is moving downward, the radius of the rotation orbit of the operating piece 663 reaches a radius that passes through the switch lever 632. As a result, the switch lever 632 is operated by the operating piece 663. When the switch lever 632 is operated by the operating piece 663, the power supply to the hoisting machine 3 is stopped and the brake of the hoisting machine 3 is activated.

[0055] If the car 8 continues to move downward even after the power supply to the hoisting machine 3 is stopped, the speed of the car 8 continues to increase. In this case, when the speed of the car 8 reaches the emergency stop excessive speed, the gripping mechanism 64 is activated and the governor rope 16 is gripped by the gripping mechanism 64. This stops the movement of the governor rope 16.

[0056] When the movement of the governor rope 16 stops, the operating lever 15 is operated to activate the safety device 14. This stops the movement of the car 8.

[0057] Next, a procedure for replacing the balance spring 68 with a new balance spring will be described. When replacing the balance spring 68, first, the retaining member 672 is removed from the connecting rod 673 of the support body 671.

[0058] When removing the anti-detachment member 672 from the connecting rod 673, the connecting rod 673 is pushed in against the elastic restoring force of the balance spring 68, thereby removing the protrusion 676 fitted in the recess 672b of the anti-detachment member 672 from the recess 672b. Thereafter, the anti-detachment member 672 is rotated in the circumferential direction of the anti-detachment member 672 relative to the sheave-side end 673b of the connecting rod 673, so that the position of the groove 672a in the circumferential direction of the anti-detachment member 672 coincides with the position of the protrusion 676. Thereafter, the anti-detachment member 672 is removed from the sheave-side end 673b while moving the anti-detachment member 672 along the groove 672a relative to the protrusion 676.

[0059] Thereafter, the connecting rod 673 is pulled out of the through-hole 653, thereby removing the support body 671 from the spring attachment part 652. Thereafter, the balance spring 68 is removed from the support body 671. Thereafter, a new balance spring for replacement is attached to the support body 671 by passing the connecting rod 673 through the inside of the new balance spring.

[0060] Thereafter, with the new balance spring attached to the spring mounting portion 652, the sheave-side end 673b of the connecting rod 673 is inserted into the through-hole 653, and the anti-detachment member 672 is attached to the sheave-side end 673b that protrudes on the opposite side of the spring mounting portion 652. The anti-detachment member 672 is attached to the sheave-side end 673b in the reverse order of the order in which the anti-detachment member 672 was removed from the sheave-side end 673b. In this way, the balance spring 68 is replaced with a new balance spring.

[0061] In this governor 6, the anti-detachment member 672 is detachably attached to the support main body 671. The anti-detachment member 672 prevents the support main body 671 from coming off the spring mounting portion 652 by engaging with the spring mounting portion 652. The balance spring 68 becomes detachable from the support main body 671 by removing the anti-detachment member 672 from the support main body 671. This makes it easy to remove the support main body 671 from the spring mounting portion 652. This makes it easy to remove the balance spring 68 from the support main body 671 and install a new balance spring in the support main body 671. Therefore, the balance spring 68 can be easily replaced.

[0062] The anti-detachment member 672 is a cylindrical member through which the sheave-side end 673b, which is the mounting shaft of the connecting rod 673, is inserted. A protrusion 676 is provided on the outer peripheral surface of the sheave-side end 673b. A groove 672a, into which the protrusion 676 can be inserted, is provided on the inner peripheral surface of the anti-detachment member 672 along the shaft insertion direction. Therefore, by shifting the position of the groove 672a from the position of the protrusion 676 in the circumferential direction of the anti-detachment member, the protrusion 676 can prevent the anti-detachment member 672 from being removed from the sheave-side end 673b. Furthermore, by aligning the position of the groove 672a with the position of the protrusion 676 in the circumferential direction of the anti-detachment member, the anti-detachment member 672 can be removed from the sheave-side end 673b by moving the protrusion 676 along the groove 672a. Therefore, the anti-detachment member 672 can be easily attached to and detached from the sheave-side end 673b.

[0063] Furthermore, anti-detachment member 672 is provided with recessed portion 672b into which protrusion 676 fits. Therefore, protrusion 676 fits into recessed portion 672b, thereby preventing anti-detachment member 672 from rotating in the circumferential direction of anti-detachment member 672 relative to sheave-side end 673b. This prevents anti-detachment member 672 from accidentally rotating relative to sheave-side end 673b while governor 6 is in use, and thereby preventing anti-detachment member 672 from accidentally coming off sheave-side end 673b.

[0064] In the first embodiment, recessed portion 672b is provided in retaining member 672. However, retaining member 672 does not have to have recessed portion 672b. Even in this case, retaining member 672 can be easily attached to and detached from sheave-side end portion 673b of connecting rod 673.

[0065] Furthermore, in the first embodiment, the outer diameter of the intermediate portion 673c is larger than the outer diameter of the sheave-side end portion 673b of the connecting rod 673. However, the outer diameter of the intermediate portion 673c may be the same as the outer diameter of the sheave-side end portion 673b, or the outer diameter of the intermediate portion 673c may be smaller than the outer diameter of the sheave-side end portion 673b.

[0066] Embodiment 2 FIG. 7 is a front view showing the interlocking mechanism of the speed governor according to the second embodiment. FIG. 7 is a view corresponding to FIG. 3 in the first embodiment. In this embodiment, two nuts 677 are used as the retaining member. The sheave-side end 673b of the connecting rod 673 is threaded. In this embodiment, the outer diameter of the sheave-side end 673b of the connecting rod 673 is the same as the outer diameter of the middle portion 673c of the connecting rod 673. The two nuts 677 are threaded onto the sheave-side end 673b. Each nut 677 can be removed from the sheave-side end 673b by turning the nut 677 relative to the sheave-side end 673b. In this way, each nut 677 is detachably attached to the sheave-side end 673b.

[0067] The two nuts 677 are attached to the sheave side end 673b in a double nut state where they overlap each other in the longitudinal direction of the connecting rod 673. The two nuts 677 engage with the spring mounting portion 652 to prevent the support main body portion 671 from coming off the spring mounting portion 652. The other configurations are the same as those in the first embodiment.

[0068] In this way, even when two nuts 677 are used as the retaining members, each nut 677 can be easily attached to and detached from the sheave-side end 673b of the connecting rod 673 by simply turning each nut 677. This makes it easy to remove the support main body 671 from the spring mounting portion 652, and makes it easy to replace the balance spring 68. Also, general-purpose nuts can be used as each nut 677. This makes it possible to suppress an increase in the cost of the retaining members.

[0069] Furthermore, the two nuts 677 are attached to the sheave-side end 673b in a double-nut state, which prevents the nuts 677 from loosening and prevents the two nuts 677 from accidentally coming off the sheave-side end 673b.

[0070] Embodiment 3 Fig. 8 is a front view showing the interlocking mechanism of a governor according to embodiment 3. Fig. 8 is a view corresponding to Fig. 3 in embodiment 1. In this embodiment, a pin 678 is used as a retaining member. A pin hole 679 is provided in sheave-side end 673b of connecting rod 673. In this embodiment, the outer diameter of sheave-side end 673b of connecting rod 673 is the same as the outer diameter of middle portion 673c. Pin hole 679 is a through-hole that passes through connecting rod 673 in a direction intersecting the longitudinal direction of connecting rod 673.

[0071] The pin 678 is inserted into the pin hole 679. As a result, both ends of the pin 678 protrude from the outer circumferential surface of the sheave-side end 673b. The pin 678 is attached to and detached from the sheave-side end 673b by being inserted into and removed from the pin hole 679. As a result, the pin 678 is detachably attached to the sheave-side end 673b. The pin 678 prevents the support main body 671 from coming off the spring mounting portion 652 by engaging with the spring mounting portion 652. The other configurations are the same as those in the first embodiment.

[0072] In this way, even when the pin 678 is used as a retaining member, the pin 678 can be easily attached to and detached from the sheave-side end 673b of the connecting rod 673 simply by inserting and removing the pin 678 into and from the pin hole 679. This makes it easy to remove the support main body 671 from the spring mounting portion 652, and makes it easy to replace the balance spring 68. Also, a commonly used pin can be used as the pin 678. This makes it possible to suppress an increase in the cost of the retaining member.

[0073] In the third embodiment, the pin hole 679 is a through hole that penetrates the sheave-side end 673b. However, the pin hole 679 does not have to be a through hole. For example, the pin hole may be a blind hole that does not penetrate the sheave-side end 673b. In this case, the depth direction of the pin hole is set to a direction that intersects with the longitudinal direction of the connecting rod 673. Also, in this case, when the pin 678 is inserted into the pin hole, only one end of the pin 678 protrudes from the outer peripheral surface of the sheave-side end 673b. Even in this case, the pin 678 can be easily attached to and detached from the sheave-side end 673b of the connecting rod 673 by simply inserting and removing the pin 678 into and from the pin hole.

[0074] Furthermore, in each of the above embodiments, the speed governor 6 is used in an elevator that is provided with a machine room 2. However, the speed governor 6 may also be used in a machine-room-less elevator, which is an elevator that is not provided with a machine room.

[0075] The configurations described in the above embodiments are merely examples of the contents of the present disclosure. The embodiments can be combined with other known technologies. Part of the configuration of the embodiments can be omitted or modified without departing from the gist of the present disclosure. [Explanation of symbols]

[0076] 6 Governor, 8 Cage (lifting body), 9 Counterweight (lifting body), 65 Governor sheave, 66 Centrifugal weight, 67 Spring support member, 68 Balance spring, 652 Spring mounting portion, 671 Support body portion, 672 Anti-detachment member, 672a Groove, 673b Sheave side end (mounting shaft), 676 Protrusion, 677 Nut (anti-detachment member), 678 Pin (anti-detachment member), 679 Pin hole.

Claims

1. a governor sheave that rotates in response to the movement of the lifting body; a centrifugal weight provided on the governor sheave and displaced relative to the governor sheave by receiving centrifugal force accompanying rotation of the governor sheave; a spring support member that is displaced relative to the governor sheave in response to displacement of the centrifugal weight relative to the governor sheave; a balance spring that generates an elastic restoring force that opposes the centrifugal force in response to displacement of the spring support member relative to the governor sheave; Equipped with A spring mounting portion is fixed to the governor sheave, The spring support member has a support body and a retaining member, the support body portion is connected to the centrifugal weight and is provided displaceably on the spring mounting portion, the stopper member is detachably attached to the support body portion and engages with the spring mounting portion to prevent the support body portion from being detached from the spring mounting portion, the balance spring is provided on the support body portion, the spring mounting portion receives the balance spring; An elevator governor in which the balance spring becomes removable from the support body when the anti-detachment member is removed from the support body.

2. The support body has a mounting shaft, the retaining member is a cylindrical member through which the mounting shaft is passed, A protrusion is provided on the outer circumferential surface of the mounting shaft, the protrusion is located at a position closer to the tip end of the mounting shaft than the anti-removal member in a shaft passing direction, which is a direction in which the mounting shaft is passed through the anti-removal member, a groove into which the protrusion can be inserted is provided along the shaft insertion direction on an inner peripheral surface of the retaining member; The position of the groove is shifted from the position of the protrusion in the circumferential direction of the anti-detachment member, thereby preventing the anti-detachment member from coming off the mounting shaft, 2. The elevator governor according to claim 1, wherein the position of the groove coincides with the position of the protrusion in the circumferential direction of the anti-detachment member, thereby enabling the anti-detachment member to be removed from the mounting shaft in the shaft insertion direction while the protrusion moves in the groove.

3. The support body has a threaded portion, 2. The elevator governor according to claim 1, wherein the retaining member is a nut attached to the threaded portion.

4. The support body is provided with a pin hole, 2. The elevator governor according to claim 1, wherein the retaining member is a pin inserted into the pin hole.

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