JP5341400B2 - Manual lowering device in case of power failure of elevator - Google Patents

Description

  The present invention relates to a manual lowering device at the time of a power failure of an elevator, and more particularly to an elevator capable of moving an elevator up and down.

  As a conventional elevator, for example, as described in Patent Document 1, an elevator body is disposed on a rail so that the elevator body can be raised and lowered, an electric drive motor is disposed on the elevator body, and the drive motor is used as a braking means. A drum brake that is interlocked and connected is known. During normal operation, power supply to the drive motor is stopped, so that the drive motor is stopped and the lifting body is stopped.

  Further, when a load higher than a predetermined value is applied to the lifting body and the lifting body descends at a speed higher than the predetermined value, the drum brake is activated to lower the lifting body at a constant speed.

Such a drum brake has a brake shoe attached to a brake shaft linked to a drive motor, while a brake drum is attached to a casing of the lifting body, and the brake shoe expands in diameter by the action of centrifugal force generated by the rotation of the brake shaft, The outer peripheral surface of the brake shoe is in contact with the inner peripheral surface of the brake drum, and the rotation of the brake shaft is held constant by the frictional force.
JP 2000-310261 A

  However, in the event of a power outage, the supply of power for raising and lowering is interrupted, so that the elevator cannot be driven, and there is a problem that people in the elevator are trapped in the elevator.

  The present invention has been made to solve the above-described problem, and provides an elevator that can be lowered to a safe place even when a state in which the elevator cannot be driven due to a power failure or a drive system failure occurs. With the goal.

Therefore, according to the present invention, in the elevator in which the elevator is movable up and down through a pinion that is rotatable by the drive motor along a rail that is provided with a rack and is vertically suspended, the drive motor is not energized. A brake function for sometimes stopping the rotation of the pinion is provided, and a manual lowering device for releasing the brake function and freeing the rotation of the pinion is interposed between the drive motor and the pinion, The pinion is linked to a drum brake that brakes according to a constant rotational speed, and the manual lowering device is linked to a lever body that is pivotally supported in a lifting body and one end side of the lever body. In addition to being connected, the other end is composed of a wire member interlocked with a spring release member that urges a brake function spring in the drive motor. The spring release member is connected between a manual release lever that releases the brake function by a manual rotation operation, and a fixing member of the main body of the drive motor and the manual release lever. A coil spring that urges in a functioning direction, and connects the other end of the wire member to the manual release lever, and pulls the wire member by turning the lever body when deenergized to drive the drive By releasing the brake function of the motor in the elevator body, operating the lever body, operating the manual release lever in the direction of biasing the coil spring via the wire member, and releasing the operation, A lifting machine characterized in that a brake function in a drive motor is applied or released so that the lifting body can be lowered by its own weight while braking with the drum brake. It is an do subjected.

  The present invention is implemented in the form as described above, and has the following effects.

According to the present invention, in the elevator in which the elevator is movable up and down via a pinion that is rotatable by the drive motor along a rail that is provided with a rack and is vertically suspended, A brake function for stopping the rotation of the pinion is provided, and a manual lowering device for releasing the brake function and freeing the rotation of the pinion is interposed between the drive motor and the pinion, and the pinion Is linked to a drum brake that brakes according to a constant rotational speed, and the manual lowering device is linked to a lever body that is pivotally supported in a lifting body and one end side of the lever body. In addition, the other end side is composed of a wire member interlocked with a spring release member that urges a brake function spring in the drive motor. The spring release member is connected between the manual release lever that releases the brake function by a manual rotation operation, and the fixing member of the main body of the drive motor and the manual release lever so that the brake function is functioned. And the other end side of the wire member is connected to the manual release lever.
Further, when the current is not energized, the wire member is pulled by the rotation of the lever body to release the brake function of the drive motor in the elevator body, operate the lever body, and operate the manual release lever via the wire member. By operating in the direction in which the coil spring is urged, and releasing the operation , the brake function in the drive motor is applied or released, and the elevator body is moved while braking with the drum brake. Since the vehicle can be lowered by its own weight, even if a power failure or a drive system breaks down, it is possible to manually release the brake function of the drive motor and lower the lifting body to a safe place at a constant speed.

  That is, during normal operation, the elevator can transmit the rotational force from the drive motor to the pinion, and can freely move the elevator up and down along the rail provided with the rack. And when the power supply is not energized, the brake function of the drive motor is activated and the elevator is stopped.By releasing the brake function with the manual lowering device, the pinion is made free, and the lifting body is moved by its own weight. Lower. Then, the drum brake interlocked with the pinion is actuated by the rotation of the pinion, and the lifting body descends at a constant speed by the braking of the drum brake.

  In this way, even when the lifting body is stopped due to a power failure or a drive system failure, the brake function of the drive motor is canceled with the manual lowering device, and the lifting body is moved to its own weight while braking with the drum brake. The person who is on the lifting body can get down to a safe place.

  The elevator according to the present invention is configured such that a lifting body can be raised and lowered via a pinion that can be driven by a drive motor along a rail that is provided with a rack and is vertically suspended.

  As a characteristic structure, the drive motor has a brake function for stopping the rotation of the pinion when not energized, and the rotation of the pinion is released between the drive motor and the pinion by releasing the brake function. A manual lowering device is provided for freeing the pinion, and the pinion is interlocked and connected to a drum brake that operates a brake according to a constant rotational speed.

  Further, as a characteristic structure, the brake function of the drive motor applies braking to the lifting body by a biasing force of a spring when not energized, and releases braking to the lifting body when energized.

  Further, as a characteristic structure, the manual lowering device includes a lever body pivotally supported in the lifting body, and one end of the lever body linked to the lever body, and the other end serving as a brake function in the drive motor. A wire member interlocked with a spring release member that urges the spring, and when the current is not energized, pulling the wire member by rotating the lever body to release the brake function of the drive motor, While raising and lowering with a drum brake, the elevating body can be lowered at a constant speed by its own weight.

  Embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, an elevator 1 according to the present invention is installed in a tower of a wind power generator, for example. In the tower, as shown in FIGS. 1 to 3, the elevator 1 is provided with a rail 2 attached to a ladder (not shown) and extended in the vertical direction, and can be moved up and down along the rail 2. It is comprised with the raising / lowering body 3 of a substantially rectangular box shape.

  Thus, since the rail 2 is attached to the ladder, the elevator 1 can be installed using the ladder of an existing steel tower (not shown). Moreover, the rail 2 forms the rack 5 extended along the rail main body 4 in the surface center part of the rail main body 4 of the cross-section H type attached to the ladder.

  As shown in FIGS. 1 and 2, the elevating body 3 has a traveling unit 7 disposed on the back side of the rectangular box-shaped casing 6, and a loading platform 12 disposed on the front side upper portion of the casing 6. The drive unit 14 is disposed in the lower part on the front side of the casing 6.

  The casing 6 is attached with a rectangular box-shaped frame 8, a flat loading platform 9 is horizontally attached to the middle of the frame 8, and a flat bottom plate 10 is horizontally attached to the lower end of the frame 8. . In the figure, reference numerals 11 denote legs attached to the four corners of the bottom plate 10.

  The loading platform 12 is configured so that an operator and a work load can be placed on the loading platform 9.

  The traveling unit 7 has a pair of left and right auxiliary wheel supports 13, 13 attached to the back of a rectangular box-shaped frame 8 at two locations with a space in the vertical direction, and a pair of front and rear auxiliary wheels supports 13, 13. The traveling wheels 15 and 15 are rotatably attached with a space in the front-rear direction, and guide wheels 16 and 16 are rotatably attached to the inner sides of the auxiliary wheel supports 13 and 13, respectively.

  Then, the flange 17 of the rail 2 is clamped from the vertical direction by the traveling wheels 15 and 15, and the flange 17 of the rail 2 is clamped from the horizontal direction by the guide wheels 16, 16, so that the lifting body 3 is detached along the rail 2. It is possible to move smoothly without looping.

  The drive unit 14 rotatably attaches a pinion 18 to the lower back portion of the frame 8 and meshes the pinion 18 with the rack 5.

  Then, by rotating the pinion 18, the pinion 18 travels along the rack 5.

  As shown in FIGS. 4 to 5, the drive unit 14 is provided with a driving means 21 for raising and lowering the elevating body 3 on the upper right side of the bottom plate 10, and the elevating body 3 on the upper left side of the bottom plate 10. Braking means 22 for lowering at a constant speed is provided. Further, as shown in FIG. 2, a power feeding box 41 is disposed at the bottom of the bottom plate 10.

  As shown in FIGS. 4 to 5, the drive means 21 has a reduction gear box 25 linked to the electromagnetic motor 24, and a pair of left and right drive sprockets 27, 27 are attached to the output shaft 26 of the reduction gear box 25. The pinion drive shaft 19 is rotatably attached to the lower portion of the rear surface of the frame body 8 in the left-right width direction, and the pinion 18 is attached to the substantially central portion of the pinion drive shaft 19 and the right end of the pinion drive shaft 19 is attached. A pair of left and right driven sprockets 28, 28 are attached to the section, and a pair of left and right transmission chains 29, 29 are suspended between the driven sprockets 28, 28 and the drive sprockets 27, 27. The electromagnetic motor 24 is connected to a power source (not shown).

  The electromagnetic motor 24 has a built-in stop mechanism that holds the drive shaft (not shown) of the electromagnetic motor 24 and stops the electromagnetic motor 24 when power supply from the power source to the electromagnetic motor 24 is stopped.

  That is, the electromagnetic motor 24 (drive motor) is of a general spring close type, and when a voltage is applied to the coil, the armature suppressed by the spring is sucked, and the spring is pushed to form a gap between the armature and the disk plate. And a structure for releasing the braking force. Further, when the voltage is not supplied to the coil, the biasing of the spring is released, the armature is pressed against the disk plate, and a braking force is applied.

  When the electromagnetic motor 24 is driven, the power of the electromagnetic motor 24 is transmitted to the pinion 18 via the reduction gear box 25, the transmission chains 29 and 29, and the pinion drive shaft 19, and the pinion 18 travels along the rack 5. Thereby, the elevating body 3 moves up and down along the rail 2.

  Therefore, during normal operation, the lifting body 3 can be stopped by stopping the power supply to the electromagnetic motor 24. When a power failure occurs, the supply of electric power to the electromagnetic motor 24 is cut off, and the urging force of the spring in the electromagnetic motor 24 is released so that the lifting body 3 can be stopped.

  As described above, since the driving means 21 transmits the power of the electromagnetic motor 24 to the pinion 18 by the two transmission chains 29, 29, even if one transmission chain 29 breaks, it is no longer necessary. Since the power of the electromagnetic motor 24 can be reliably transmitted to the pinion 18 by one transmission chain 29, the safety of the elevator 1 can be ensured.

  The braking means 22 is disposed at the upper left portion of the bottom plate 10 and has a drive sprocket 31 attached to the left end portion of the pinion drive shaft 19, while a speed increasing gear box 32 is attached to the upper left rear portion of the bottom plate 10. A driven sprocket 34 is attached to the input shaft 33 of the high-speed gear box 32, a drum brake 37 is linked to the output shaft 36 of the speed-up gear box 32, and a transmission chain is connected between the drive sprocket 31 and the driven sprocket 34. 35 is suspended.

  As shown in FIG. 6, the drum brake 37 is housed in the substantially cylindrical brake drum 38 connected to the front end edge of the bottom plate 10 of the casing 6, and inside the brake drum 38. The brake shoe 39 is interlocked with the 32 output shafts 36. In the figure, 40 is a bearing, 30 is a bearing support, and 42 is a shaft end cover mounting bolt.

  In the brake shoe 39, eight shoe support bodies 44 project radially from the outer peripheral surface of a boss 43 connected to the output shaft 36 of the speed increasing gear box 32, and a cross-sectional arc shape is formed at the tip of each shoe support body 44. The shoe 45 is continuously provided.

  In the drum brake 37, the shoe support 44 of the brake shoe 39 is extended by the action of centrifugal force as the output shaft 36 of the speed increasing gear box 32 is rotated, so that the outer peripheral surface 46 of the shoe 45 is outward. The outer peripheral surface 46 of the shoe 45 abuts on the inner peripheral surface 47 of the brake drum 38, and the frictional force reduces the rotation of the output shaft 36 of the speed increasing gear box 32 and is linked to the output shaft 36. The rotation of the pinion drive shaft 19 is reduced, and the lifting body 3 is lifted and lowered at a constant speed.

  Further, between the drum brake 37 and the casing 6, torque detecting means 48 for detecting torque acting on the brake drum 38 of the drum brake 37 is interposed.

  As shown in FIG. 6, the torque detection means 48 is attached to the casing 6 of the lifting body 3 so that the brake drum 38 rotates only when a torque greater than a predetermined value acts on the brake drum 38. The brake drum 38 is interlocked with emergency stop means 23 (shown in FIGS. 7 and 8).

  That is, the base end portion of the support body 49 is attached to the front end edge of the bottom plate 10 of the casing 6, and the torque limiter 50 (for example, TL250-1 manufactured by Sakai head office) is attached to the front end portion of the support body 49. 50, a brake drum 38 is mounted, and a drive sprocket 51 is mounted coaxially with the brake drum 38 between the torque limiter 50 and the brake drum 38, and the emergency stop means 23 is linked to the drive sprocket 51. Yes. In the figure, 52 is a connecting body, and 53 is a connecting bolt.

  The torque limiter 50 holds the connecting body 52 with a predetermined tightening force, and when a torque that rotates the connecting body 52 against the tightening force is applied, the holding of the connecting body 52 is released. The coupling body 52 is configured to be rotatable.

  The torque detecting means 48 is configured such that the outer peripheral surface 46 of the shoe 45 abuts on the inner peripheral surface 47 of the brake drum 38 during braking by the drum brake 37, and the outer peripheral surface 46 of the shoe 45 and the inner peripheral surface 47 of the brake drum 38. Torque acting on the brake drum 38 is detected by the torque limiter 50 due to the frictional force generated between the torque limiter 50 and the torque limiter 50 releases the holding of the coupling body 52 when the torque exceeds a predetermined value. Thus, the brake drum 38 and the drive sprocket 51 are rotated in conjunction with the rotation of the output shaft 36 of the speed increasing gear box 32, and are transmitted from the drive sprocket 51 to the emergency stop means 23.

  Further, when the drum brake 37 is operated, heat is generated by friction between the outer peripheral surface 46 of the brake shoe 39 and the inner peripheral surface 47 of the brake drum 38, and the friction heat generates the heat from the outer peripheral surface 46 of the brake shoe 39 and the brake drum. The torque detecting means 48 detects that the torque acting on the brake drum 38 has become a predetermined value or more before the frictional force with the inner peripheral surface 47 of 38 decreases and the braking force decreases. The emergency stop means 23 is activated to forcibly stop the elevating body 3.

  As shown in FIG. 4, the emergency stop means 23 rotatably attaches a transmission shaft 54 extending in the front-rear direction above the bottom plate 10 of the casing 6, and attaches a driven sprocket 55 to the base end portion of the transmission shaft 54. The transmission chain 56 is suspended between the driven sprocket 55 and the drive sprocket 51, and a gear 57 is attached to the tip of the transmission shaft 54. The brake rotor 58, 58 are provided. In addition, the base ends of a pair of left and right brake shafts 59, 59 that are rotatably attached to the frame body 8 in a state of being extended in the front-rear direction to the respective brake rotating bodies 58, 58 are interlocked and connected to each brake shaft. Rail clamps 60 and 60 are attached to the front ends of 59 and 59, respectively.

  As shown in FIG. 7, the rail holding bodies 60 and 60 have a shape in which the outer periphery is crisp and the radius is gradually enlarged in a plan view.

  The emergency stop means 23 rotates the drive sprocket 51 in conjunction with the rotation of the brake drum 38 when the torque detection means 48 detects that a torque greater than a predetermined value is applied to the brake drum 38. The brake shafts 59, 59 rotate, and accordingly, both the rail holding bodies 60, 60 rotate, the distance between the both rail holding bodies 60, 60 is reduced, and the outer peripheral surfaces 74, 60 of both the rail holding bodies 60, 60 are reduced. 74, the flange 17 of the rail 2 is clamped to forcibly stop the elevating body 3 (rail catch method).

  As described above, since the rail sandwiching bodies 60, 60 have a shape in which the outer periphery is crisp and the radius is gradually enlarged in plan view, the outer peripheral surfaces 74, 74 of the rail sandwiching bodies 60, 60 contact the flange 17 of the rail 2. Then, due to the frictional force between the outer peripheral surfaces 74, 74 of the rail clamping bodies 60, 60 and the side surface of the flange 17 of the rail 2, the rail clamping bodies 60, 60 are more firmly clamped by the flange 17 of the rail 2. It will rotate, and the raising / lowering body 3 can be stopped reliably.

  And the elevator 1 in this embodiment makes it possible to lower the raising / lowering body 3 to a predetermined location by the manual lowering device 80 at the time of a power failure as described below. Hereinafter, the manual lowering device 80 of the elevator 1 at the time of a power failure will be described with reference to FIGS.

  As shown in FIGS. 2 and 8, the manual lowering device 80 of the elevator 1 includes a manual lowering lever 61 (lever body) in the right rear portion of the loading platform 12. As shown in FIGS. 9 and 10, the manual lowering lever 61 has a substantially cylindrical shape, and includes a lever main body 63 whose front end extends downward. The lever main body 63 includes a mounting body 62 on the rear wall portion in the elevating section, and the base end portion of the lever main body 63 can be inserted into the inner side of the mounting body 62. Further, the lever main body 63 is pivotally connected so as to be pivotable up and down in the middle of the attachment body 62 by providing a connection pin 64.

  Further, by inserting the lock pin 65 into the pin hole in the attachment body 62, the lever main body 63 is attached and fixed to the inner side portion of the attachment body 62. That is, the lock pin 65 is fixed so that the lever body 63 is not operated except in an emergency. Further, the lock pin 65 is connected to a fixed wire 66 screwed to the frame body 8 with a screw 67 so that the lock pin 65 is not lost from the attachment body 62 when being attached or detached. In an emergency, the lock pin 65 is detachably attached, and by pulling out the lock pin 65, the lever body 63 is provided so as to be rotatable upward.

  Further, one end of the wire 68 is connected to the middle part of the lever main body 63, and the other end of the wire 68 is connected to a mechanism for releasing a brake function to be described later on the electromagnetic motor 24 side. As the wire 68, a type in which an inner wire is slidably inserted into a covering body is used.

  As shown in FIGS. 4 to 5, the electromagnetic motor 24 has a manual release lever 70 for manually releasing the brake function, and the manual release lever 70 is tilted to the lift opening side (A direction). A brake function spring (not shown) in the electromagnetic motor 24 is pushed to form a gap between the armature and the disk plate so as to release the braking force. Further, when the manual release lever 70 is tilted to the rail side, the brake function spring in the electromagnetic motor 24 is released, the armature is pressed against the disk plate, and the brake function is activated.

  In such an electromagnetic motor 24, the main body of the tension member 69 is pivotally supported coaxially with the manual release lever 70. The tension body 69 has a substantially “<”-shaped main body, and the other end of the wire 68 from the manual lowering lever 61 is linked to one end thereof. The manual release lever 70 is connected to a fixing member 73 installed at the upper part of the main body of the electromagnetic motor 24 via a coil spring 72.

  In this way, by operating the manual release lever 70 which is the manual lowering device 80, the spring of the brake function in the electromagnetic motor 24 is operated via the wire 68, and the brake function in the electromagnetic motor 24 is activated. Or cancel.

Next, the manual lowering method at the time of power failure of the elevator 1 will be described.
First, as shown in FIGS. 9 and 10, the lock pin 65 installed on the manual lowering lever 61 is removed, and the lever main body 63 is made rotatable. Next, the hand gripping portion of the lever body 63 is held by hand, and the lever body 63 is rotated upward by hand in the direction A shown in FIG. The pulled wire 68 is pulled from one end thereof. Accordingly, the tension member 69 provided on the other end side of the wire 68 and coaxially with the shaft portion 71 of the manual release lever 70 of the brake function of the electromagnetic motor 24 is connected to the shaft portion shown in FIG. It can be rotated clockwise (B direction) about 71 as an axis.

  The tension member 69 is formed coaxially with the shaft portion 71 of the manual release lever 70 attached to the electromagnetic motor 24. Thus, if the tension member 69 is rotated in the direction B in FIG. 8, the manual release lever 70 provided on the same axis is simultaneously rotated in the direction C shown in FIG. Further, in the electromagnetic motor 24, a mechanism for biasing the spring by turning the manual release lever 70 is provided. In other words, the spring is biased by the rotation of the manual release lever 70 to form a gap between the armature in the electromagnetic motor 24 and the disk plate, thereby releasing the braking force. In this way, the brake operation of the electromagnetic motor 24 can be released.

  The elevator 1 descends at a constant speed while being braked by the braking means. That is, in the drum brake 37, the shoe support 44 of the brake shoe 39 is extended by the action of centrifugal force as the output shaft 36 of the speed increasing gear box 32 rotates, so that the outer peripheral surface 46 of the shoe 45 is outward. The outer peripheral surface 46 of the shoe 45 abuts on the inner peripheral surface 47 of the brake drum 38, and the frictional force reduces the rotation of the output shaft 36 of the speed increasing gear box 32 and is linked to the output shaft 36. The rotation of the pinion drive shaft 19 is reduced, and the elevating body 3 is lowered to a predetermined safe position at a constant speed.

  Even if the brake function of the electromagnetic motor 24 is released, the rotational movement of the pinion 18 can be suppressed by the reduction gear box 25, so that the descent speed of the elevating body 3 can be suppressed and the descent can be performed at a constant speed. I have to.

  As a result, the elevator 1 in this embodiment can be lowered to a predetermined safe position even if a power failure or a drive system breaks down. After the elevator 1 is lowered to a safe position, the brake function is applied to the electromagnetic motor 24 by returning the manual lowering lever 61 to the original position, so that the lowering of the elevator 3 can be stopped.

  As described above, the elevator 1 according to the present embodiment sets the pinion 18 in the free state by releasing the brake function of the electromagnetic motor 24 that has been activated at the time of de-energization such as a power failure or the failure of the drive system by the manual lowering device 80. The elevating body 3 is lowered by its own weight, and the elevating body 3 is lowered at a constant speed by braking of the drum brake that receives the rotational force of the pinion 18.

  Thus, even if the lifting body 3 is stopped due to a power failure or a drive system failure, a person riding on the lifting body 3 can get off to a safe place.

  The electromagnetic motor 24 includes a spring-closed electromagnetic brake that is braked by the biasing force of the spring when de-energized and is released when the power is energized. The elevating body 3 can be stopped, and the brake function of the electromagnetic motor 24 can be released by urging the brake function spring attached to the electromagnetic motor 24.

  In particular, the manual lowering device 80 includes a manual lowering lever 61 pivotally supported in the elevating body 3 and one end thereof linked to the manual lowering lever 61 and the other end connected to the electromagnetic motor 24. The wire 68 is interlocked with a manual release lever 70 for urging a spring having an internal brake function. When the electromagnetic motor 24 is de-energized, the wire 68 is pulled by the rotation of the manual lowering lever 61 and the manual release lever 70 attached to the electromagnetic motor 24 is rotated to rotate the electromagnetic motor 24. By releasing the brake function, the lifting body 3 can be lowered by its own weight while braking by the drum brake 37, so that the brake function of the electromagnetic motor 24 of the elevator 1 can be manually canceled even during a power failure. Thus, the elevating body 3 can be lowered to a safe place at a constant speed.

  In addition, although this embodiment demonstrated the elevator 1 installed in the tower of a wind power generator, it is not restricted to this, For example, it can apply also to the monorail etc. which raise / lower the inclined surface of a dam or a predetermined gradient. it can. It can also be applied to a monorail for transportation of people and a monorail for construction.

It is a rear view which shows the whole structure of the elevator in this embodiment. It is a side view which shows the whole structure of the elevator in this embodiment. It is a top view which shows the whole structure of the elevator in this embodiment. It is a top view which shows the structure of the drive means of an elevator in this embodiment, a braking means, and an emergency stop means. It is a top view which shows the structure of the pinion drive shaft of the elevator in this embodiment. It is sectional drawing which shows the structure of the drum brake of the elevator in this embodiment. It is a front view which shows the structure of the emergency stop means of the elevator in this embodiment. It is a side view which shows the structure of the manual lowering apparatus of the elevator in this embodiment. It is a top view which shows the structure of the manual lowering lever of the elevator in this embodiment. It is a side view which shows the structure of the manual lowering lever of the elevator in this embodiment.

Explanation of symbols

1 Elevator 5 Rack 18 Pinion 24 Drive Motor 37 Drum Brake 61 Manual Lowering Lever (Lever Body)
80 Manual lowering device

Claims (1)

In a lift that can be moved up and down through a pinion that can be rotated by a drive motor along a rail that is provided with a rack and is vertically suspended,
The drive motor has a brake function to stop the rotation of the pinion when not energized,
Between the drive motor and the pinion is a manual lowering device that releases the brake function and frees the rotation of the pinion,
The pinion is linked to a drum brake that operates according to a constant rotational speed,
The manual lowering device includes a lever body pivotally supported in the lifting body,
One end side of the lever body is interlocked and connected, and the other end side is constituted by a wire member interlocked and connected to a spring release member that biases a spring having a brake function in the drive motor.
The spring release member is connected between a manual release lever that releases a brake function by a manual rotation operation, and a fixing member of the main body of the drive motor and the manual release lever, and functions as a brake function. A coil spring urging in the direction, and connecting the other end of the wire member to the manual release lever;
At the time of de-energization, the lever member is rotated to pull the wire member, and the brake function of the drive motor is released in the elevator.
Operate and release the brake function in the drive motor by operating the lever body, operating the manual release lever through the wire member in the direction of biasing the coil spring, and releasing the operation. A lifting machine characterized in that the lifting body can be lowered by its own weight while braking with the drum brake.

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