JPH08131568A - Fall preventing device - Google Patents

Abstract

PURPOSE: To provide a fall preventing device by which work in a high place can be safely performed with good workability. CONSTITUTION: In a fall preventing device provided with a rotational body 7 attached to a frame 8 of a take-up reel 3, a flat rope 4 wound on the rotational body 7, and an emergency lock mechanism 12 for maintaining the emergency lock state for preventing the flat rope 4 from being drawn when the flat rope 4 is drawn at a high speed, a switching means 27 for switching the state into the flat rope normal drawing state in which the emergency lock mechanism 12 is not operated is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention device for preventing a worker from falling at a work site at a high place such as a construction site.

[0002]

2. Description of the Related Art At work sites at high places such as construction sites,
A fall prevention device is used to prevent a worker from falling. This device is equipped with a rotating body attached to the frame of the take-up reel and a flat rope (life rope) wound around the rotating body. The tip of the rope is connected to the body belt of the worker, and the take-up reel and the flat rope prevent the worker from falling. Alternatively, the take-up reel may be connected to the worker's trunk belt, and the end of the flat rope may be connected to a fixed object at a work site at a high place.

Further, recently, a fall prevention device of this kind has been
Often equipped with an emergency lock mechanism. This emergency lock mechanism is configured to maintain an emergency lock state that prevents the flat rope from being pulled out when the flat rope is pulled out at a high speed, the operator crashes, and the flat rope is pulled out at a high speed. It prevents the flat rope from being pulled out and prevents the worker from falling a long distance, reducing the impact on the worker's body.

[0004]

By the way, when the fall prevention device having the emergency lock mechanism as described above is used in a place where the scaffold is wide and the user runs around, the flat lock can be pulled out by the emergency lock mechanism. There is a problem in that the work is hindered, the movement of the worker is hindered, workability is deteriorated, and it is dangerous. In addition, when the distance between the fixed object and the worker is short, the flat rope hangs down and is easily entangled in the worker's foot, which is dangerous.

Therefore, the present invention has been made in view of the present situation, and an object thereof is to provide a fall prevention device capable of performing work in a high place with good workability and safely.

[0006]

In order to achieve the above object, a fall prevention device of the present invention comprises a rotating body mounted on a frame of a take-up reel, and a flat rope wound around the rotating body. A flat rope in which the emergency lock mechanism does not operate, in a fall prevention device including an emergency lock mechanism that maintains an emergency lock state that prevents the flat rope from being pulled out at a high speed. It is characterized in that a switching means for switching to a normal withdrawal state is provided.

Further, the fall prevention device may be provided with a constant lock means for maintaining a constant lock state that constantly prevents the flat rope from being pulled out.

Further, the switching means and the constant lock means may be integrally formed so that the flat rope normal pull-out state, the emergency lock state and the constant lock state can be selectively obtained.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 to 6 show a first embodiment of the present invention. In FIG. 1, this fall prevention device is used at a work site at a high place to prevent a fall of a worker. The trunk belt 1, the buckle 2, the take-up reel 3, the flat rope 4, the hook 5, and the hook. It has a storage bag 6.

The take-up reel 3 is for taking up the flat rope 4. As shown in FIG.
Of the flat rope 4 is wound around the rotating body 7 in the frame 8. Further, the shaft 9 penetrates the frame 8 and the rotating body 7,
And the rotating body 7 is supported by the shaft 9,
The rotating body 7 rotates integrally with the shaft 9. Further, a spring 11 is covered with a cover 10 on the outer side of the frame 8 and is attached to the frame 8. The spring 11 is for elastically biasing the rotating body 7, has a spiral shape, and its inner end is the groove 9 a of the shaft 9.
And the outer end is engaged with the protrusion of the cover 10. Therefore, the spring 11 acts on the shaft 9 and the rotating body 7, the rotating body 7 is elastically biased in the rotation direction thereof, and the flat rope 4 is kept wound around the rotating body 7.

Further, the take-up reel 3 is provided with an emergency lock mechanism 12. The emergency lock mechanism 12 is for maintaining an emergency lock state that prevents the flat rope 4 from being pulled out when the flat rope 4 is pulled out at a high speed, and has a ratchet wheel 13, a paw 14, and a guide plate 15. .

The ratchet wheel 13 is arranged concentrically with the rotating body 7 and is integrated with the rotating body 7. In this embodiment, on both sides of the rotating body 7, a pair of ratchet wheels 13 is arranged concentrically with the rotating body 7 and is integrated with the rotating body 7, which is housed in the frame 8 and the space between the ratchet wheels 13 is increased. At, the flat rope 4 is wound around the rotating body 7. The pawl 14 engages with the teeth 16 of the ratchet wheel 13 to prevent the ratchet wheel 13 from rotating, and as shown in FIG. 3, both ends 17 having a reduced width and a pawl 18 provided at the tip edge are provided. Have,
The claw 18 is provided on the frame 8 of the take-up reel 3, the claw 18 faces the outer peripheral edge of the ratchet wheel 13, and both ends 17 are inserted into the notches 19 of the frame 8. The notch 19 has a fan shape, and the pawl 14 can rotate in the notch 19. Further, as shown in FIG. 4, one end of the spring 20 is engaged with the pawl 14 and the other end thereof is engaged with the cover 10, and its elasticity acts on the pawl 14, and the pawl 14 is
It is elastically biased in the clockwise direction and is pressed against one end of the notch 19.

The guide plate 15 is for guiding the pawl 14, and has teeth 26 that engage with the claws 18 of the pawl 14,
It is provided on one ratchet wheel 13 and is housed between the ratchet wheel 13 and the frame 8. Further, the long groove 21 is formed in the guide plate 15, and the sleeve 22 is fitted into the shaft 9, and this is the long groove 21 of the guide plate 15.
Has been inserted. Moreover, a long groove 23 is formed in the guide plate 15, and the pin 23 a is inserted into the long groove 23 and fixed to the ratchet wheel 13. Further, one end of each of the springs 24 and 25 is engaged with the guide plate 15 and the other end thereof is engaged with the ratchet wheel 13, and as will be described later, when the flat rope 4 is pulled out at a normal speed, the spring 2
4, 25 act on the guide plate 15, and the sleeve 22 and the pin 23a engage with one end of the long grooves 21, 23,
Is elastically supported in the position of FIG. As a result, even if the ratchet wheel 13 rotates, the pawl 14 and the guide plate 15
Teeth 26 do not engage. In the long groove 21, centrifugal force is applied to the guide plate 15.
The long groove 23 extends in an arc shape around the long groove 21. Therefore, as will be described later, when the flat rope 4 is pulled out at a high speed, the guide plate 15 moves in the radial direction of the ratchet wheel 13 based on the centrifugal force.

Further, this fall prevention device is provided with a switching means 27 as shown in FIG. The switching means 27 is
The switching handle 28 is for switching to the normal pull-out state of the flat rope in which the emergency lock mechanism 12 does not operate.
It has a typer 29. The switching handle 28 is the pole 14
For turning the cover 1 with screws 30
It is rotatably supported at the position of the outer peripheral edge of 0, one end projects from the cover 10, and the other end is accommodated in the frame 8. The switching handle 28 has an operating portion 28a at one end and a U-shaped pressing portion 28 for pressing the paw 14 at the other end.
b. The type 29 is for limiting the stroke of the switching handle 28 and is housed in the frame 8, one end is fixed to the frame 8 and the other end is housed in the groove of the U-shaped pressing portion 28b of the switching handle 28. ing. Therefore, when the switching handle 28 is rotated in the clockwise direction, the inner surface of the groove of the pressing portion 28b of the switching handle 28 comes into contact with the typer 29, and the rotation of the switching handle 28 is restricted as shown in FIG. . Also, the switching means 27
Has locking means (not shown). The locking means is for locking the switching handle 28 at the position shown in FIG. 5, and has a well-known configuration. When the switching handle 28 is at the position shown in FIG.
Is pressed against one end of the notch 19 of the frame 8 by the spring 20. In this state, even if the guide plate 15 moves in the radial direction of the ratchet wheel 13, the teeth 26 thereof do not engage with the claws 18 of the pawl 14. Therefore,
Even if the flat rope 4 is pulled out at a high speed, the rotation of the rotating body 7 is not blocked and the pulling of the flat rope 4 is not blocked.
When the switching handle 28 is in the position shown in FIG. 5, when the flat rope 4 is pulled out at a normal speed, the teeth 26 of the guide plate 15 do not engage with the pawls 18 of the pawl 14 and the rotation of the rotating body 7 is blocked. Without pulling out the flat rope 4, the flat rope 4 is pulled out at a high speed, and when the guide plate 15 moves in the radial direction of the ratchet wheel 13, its teeth 26 engage with the pawls 18 of the pawl 14, In the radial direction of the ratchet wheel 13, the claws 18 of the pawl 14 slide along the teeth 26 of the guide plate 15, and the pawl 14 is moved to the position shown in FIG.
Of the pawl 14 and the leading edge of the pawl 14 engages with the teeth 16 of the ratchet wheel 13, whereby the rotor 7
Is prevented from rotating, and the flat rope 4 is prevented from being pulled out.

In this fall prevention device, when working at a high place, the body belt 1 is wound around the body, and the hook 5 at the tip of the flat rope 4 is engaged with a fixed object at a work place at a high place.

When this fall prevention device is used in a normal work site at a high place where the scaffolding is not so wide, when the switching handle 28 of the switching means 27 is set to the position shown in FIG. 5 and the flat rope 4 is pulled out at a high speed. An emergency lock is applied to prevent the flat rope 4 from being pulled out. With the movement of the worker, the flat rope 4 is unwound from the take-up reel 3,
When pulled out at the normal speed, the springs 24 and 25 act on the guide plate 15, the sleeve 22 and the pin 23a engage with one ends of the long grooves 21 and 23, and the guide plate 15 is elastically supported in the position of FIG. Then, in this state, the flat rope 4 is pulled out, and the guide plate 15 rotates integrally with the ratchet wheel 13 and the rotating body 7. Therefore, as the ratchet wheel 13 rotates, the teeth 26 of the guide plate 15
Even if reaches the position of the pawl 18 of the paw 14, there is a gap between the tooth 26 of the guide plate 15 and the pawl 18 of the pawl 14, so the pawl 18 of the pawl 14 does not bite into the tooth 26 of the guide plate 15,
The pole 14 is not retracted to the position shown in FIG. Therefore, the engagement between the tip edge of the pawl 14 and the teeth 16 of the ratchet wheel 13 is prevented, the rotating body 7 can freely rotate, and the flat rope 4 can be pulled out without trouble.

When the worker crashes from a work site at a high place and the flat rope 4 is pulled out at a high speed accordingly, centrifugal force acts on the guide plate 15, and the guide plate 15 is pinned based on the centrifugal force. It swings around 23a, is displaced in the radial direction of the ratchet wheel 13, is absorbed by the long groove 21 and the sleeve 22, and the sleeve 22 moves along the long groove 21. Furthermore, the displacement of the guide plate 15 is limited by the long groove 21, and when the outer peripheral edge of the guide plate 15 projects to a position where it engages with the claw 18 of the pawl 14, the sleeve 22 engages with the other end of the long groove 21 and guides. The plate 15 is kept in that position. Therefore, after that, when the teeth 16 of the guide plate 15 reach the positions of the claws 18 of the paw 14 as the guide plate 15 rotates, the claws 18 of the paw 14 move to the teeth 2 of the guide plate 15.
Engage 6

Therefore, thereafter, the rotation of the guide plate 15 is blocked by the pawl 14, and the ratchet wheel 13 is stopped.
And only the rotating body 7 rotates, and the long groove 23 and the pin 23
It is absorbed by a, and the pin 23a moves along the long groove 23. At the same time, the pawls 18 of the pawl 14 are guided by the teeth 26 of the guide plate 15, and the pawls 18 of the pawl 14 slide along the teeth 26 of the guide plate 15 in the radial direction of the ratchet wheel 13 so that the pawl 14 can be seen. 6
To the position. Then, the tip edge of the pawl 14 engages with the teeth 16 of the ratchet wheel 13, whereby the rotation of the rotating body 7 is blocked.

Therefore, after the worker crashes, the rotation of the rotating body 7 is immediately stopped, and the flat rope 4 cannot be pulled out any more. Therefore, the flat rope 4 is tensioned between the fixed object at the work site at a high place and the worker, and the body of the worker is supported by the flat rope 4, thereby preventing the worker from falling.

When this fall prevention device is used at a high work site where the scaffolding is wide and runs around,
The switching handle 28 of the switching means 27 is switched to the position shown in FIG. 4 to bring the flat rope normal pull-out state in which the emergency lock mechanism 12 does not operate. In the state shown in FIG. 4, the flat rope 4 is moved to the take-up reel 3 due to the operation of the worker at the work site at a high place.
When it is unwound from and is pulled out at a high speed, the guide plate 15 swings around the pin 23a based on the centrifugal force,
The ratchet wheel 13 is displaced in the radial direction, and the sleeve 22 moves along the long groove 21. And sleeve 2
2 engages with the other end of the long groove 21 and the guide plate 15 is kept in that position. In this state, even if the teeth 26 of the guide plate 15 reach the positions of the pawls 18 of the pawl 14 as the guide plate 15 rotates, the pawls 18 of the pawl 14 do not engage with the teeth 26 of the guide plate 15. Therefore, the pawl 14 is not pulled in, the rotating body 7 can freely rotate, and the flat rope 4 is pulled out without trouble. Therefore, even if the worker runs around and works, there is no problem.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the locking means 31 is always provided. Always locking means 31
Has a switching handle 32 for always maintaining a locked state that always prevents the flat rope 4 from being pulled out.

The switching handle 32 is used to rotate the pawl 14, and is rotatably supported by a screw 30 at the position of the outer peripheral edge of the cover 10. One end of the switching handle 32 projects from the cover 10 and the other end is inside the frame 8. positioned. The switching handle 32 has an operating portion 32a at one end, and has a cowl 14 at the other end.
It has a pressing portion 32b for pressing. Further, the switching handle 32 has a stopper portion 32c between one end and the other end. The stopper 32c is the handle 32
For limiting the stroke of the switching handle 3
When 2 is rotated clockwise in FIG. 8, the stopper 3
2c contacts the cover 10, and the rotation of the switching handle 32 is restricted as shown in FIG. Further, the constant locking means 31 has a locking means (not shown). The locking means is for locking the switching handle 32 at the position shown in FIG.
A well-known structure is adopted, and a description thereof will be omitted.
The switching handle 28 of the switching means 27 is at the position shown in FIG.
When the switching handle 32 of the constantly locking means 31 is at the position shown in FIG. 8, the pawl 14 is pressed against one end of the notch 19 of the frame 8 by the spring 20. In this state, even if the guide plate 15 moves in the radial direction of the ratchet wheel 13, the teeth 26 thereof do not engage with the claws 18 of the pawl 14. Therefore, even if the flat rope 4 is pulled out at a high speed, the rotation of the rotating body 7 is not blocked and the pulling of the flat rope 4 is not blocked. When the ratchet wheel 13 rotates when the handle 32 is at the position shown in FIG. 9,
Regardless of the position of the guide plate 15, the ratchet wheel 13
16 engages with the tip edge of the pawl 14, which prevents rotation of the rotor 7. Therefore, the flat rope 4
When is pulled out, the rotation of the rotating body 7 is always blocked and the pulling out of the flat rope 4 is blocked.

The other structure is the same as that of the first embodiment.

When this fall prevention device is used at a work site where the distance between the fixed object and the worker at a high work site is short, the handle 32 of the lock means 31 is constantly switched to the position shown in FIG. The rope 4 is always locked so that it cannot be pulled out. The flat rope 4 is unwound from the take-up reel 3 along with the operation of the worker at the work site at a high place,
When the ratchet wheel 13 is pulled out, the teeth 16 of the ratchet wheel 13 are engaged with the tip edges of the pawl 14, whereby the rotation of the rotating body 7 is blocked and the pulling out of the flat rope 4 is blocked.
Therefore, the flat rope 4 does not hang down between the worker and the fixed object at the work site at a high place, and it is possible to prevent the flat rope 4 from being entangled in the foot of the worker.

Next, a third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the switching means and the constant lock means are integrally formed, and a mechanism 33 that can selectively take an emergency lock state, a normal rope normal pull-out state, and a constant lock state is provided.

The mechanism 33 has a switching handle 34. The switching handle 34 is for rotating the pawl 14, is rotatably supported by a screw 30 at the position of the outer peripheral edge of the cover 10, has one end protruding from the cover 10, and the other end housed in the frame 8. There is. Switching handle 34
Has an operating portion 34a at one end, and has a pressing portion 34b at the other end for pressing the pawl 14. Further, as shown in FIG. 11, the switching handle 34 has a hemispherical engaging protrusion 34c on the surface of the cover 10 facing the flange 10a. On the other hand, the flange 10a of the cover 10 is provided with three engagement recesses 35, 36, 37. The engaging concave portions 35, 36, 37 are the engaging convex portions 3 of the switching handle 34.
4c has a size corresponding to that of the engaging projection 34c and is arranged on one circumference centered on the center of the pin 30. The engaging convex portion 34c is the engaging concave portion 3
When a force is applied to the switching handle 34 so as to rotate around the screw 30 in a state where it is engaged with 5, 36, 37, the flange 10a is elastically deformed in the right direction in FIG. The disengagement from the engaging recesses 35, 36, 37 causes the switching handle 34 to rotate. Therefore, the switching handle 34 is rotated around the screw 30 so that the engaging convex portion 34c is engaged with the engaging concave portions 35, 36, 37, and the switching handle 3 is rotated.
4 can be locked by the engagement recesses 35, 36, 37. As shown in FIG. 12, when the engagement protrusion 34 c of the switching handle 34 is engaged with the engagement recess 35, the pole 14 is notched by the spring 20 in the notch 1 of the frame 8.
It is pressed against one end of 9. In this state, even if the guide plate 15 moves in the radial direction of the ratchet wheel 13, the teeth 26 thereof do not engage with the claws 18 of the pawl 14. Therefore, even if the flat rope 4 is pulled out at a high speed, the rotation of the rotating body 7 is not blocked and the pulling of the flat rope 4 is not blocked. As shown in FIG. 13, when the engagement protrusion 34 c of the switching handle 34 is engaged with the engagement recess 36,
When the guide plate 15 moves in the radial direction of the ratchet wheel 13, the teeth 26 thereof engage with the pawls 18 of the pawl 14, and the pawl 14 is retracted by the teeth 26 as shown in FIG. It engages with the teeth 16 of the ratchet wheel 13, which prevents rotation of the rotor 7. Therefore, when the flat rope 4 is pulled out at a high speed, the rotation of the rotating body 7 is blocked and the pulling of the flat rope 4 is blocked. As shown in FIG. 15, the switching handle 34
When the ratchet wheel 13 rotates while the engaging convex portion 34c of FIG.
Regardless of the position, the teeth 16 of the ratchet wheel 13 engage with the tip edge of the pawl 14, thereby preventing the rotation body 7 from rotating. Therefore, when the flat rope 4 is pulled out, the rotation of the rotating body 7 is always blocked, and the flat rope 4 is pulled out.

The other structure is the same as that of the first embodiment.

When this fall prevention device is used at a high work site where the scaffolding is wide and runs around,
The engaging protrusion 34c of the switching handle 34 is engaged with the engaging recess 35 to bring the flat rope normal pull-out state in which the emergency lock mechanism 12 does not operate. Further, when used in a work site where the distance between a fixed object at a work site at a high place and a worker is short, the engagement protrusion 34c of the switching handle 34 is engaged with the engagement recess 3a.
7 is engaged with the flat rope 4 so that the flat rope 4 is always prevented from being pulled out. When used in other work sites, the engagement protrusion 34c of the switching handle 34 is engaged with the engagement recess 36 to prevent the flat rope 4 from being pulled out when the flat rope 4 is pulled out at a high speed. When locked.

The emergency lock mechanism, the switching means, and the constant lock means are not limited to those shown in the above-mentioned embodiments, but other structures can be adopted.

[0031]

As described above, in the fall prevention device according to the present invention, the emergency lock mechanism can be prevented from operating, so that it is possible to prevent the worker from moving in a place where the scaffold runs widely. It does not cause any trouble, improves workability and is safe. In addition, if a configuration is provided in which a constant locking device that constantly prevents the flat rope from being pulled out is used, the flat rope does not hang down when the distance between the fixed object and the worker is short, and the flat rope does not get caught in the worker's foot. It's safe because it doesn't exist.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of a fall prevention device according to the present invention.

FIG. 2 is a vertical sectional view of the take-up reel 3 of FIG.

3 is a perspective view of the pawl 14 of FIG.

FIG. 4 is a cross-sectional view of the take-up reel 3 of FIG.

5 is a cross-sectional view showing an operating state of the switching means 27 of FIG.

6 is a cross-sectional view showing the next state of FIG.

FIG. 7 is a vertical sectional view of a take-up reel 3 of a second embodiment of the fall prevention device according to the present invention.

8 is a cross-sectional view of the take-up reel 3 of FIG.

9 is a cross-sectional view showing an operating state of the constant locking means 31 of FIG.

FIG. 10 is a vertical cross-sectional view of the take-up reel 3 of the third embodiment of the fall prevention device according to the present invention.

11 is a cross-sectional view taken along the line A-A ′ of FIG.

12 is a cross-sectional view of the take-up reel 3 of FIG.

13 is a transverse cross-sectional view showing an operating state of the mechanism 33 of FIG.

FIG. 14 is a cross-sectional view showing the next state of FIG.

15 is a cross-sectional view showing an operating state of the mechanism 33 of FIG.

[Explanation of symbols]

 3 Take-up reel 4 Flat rope 7 Rotating body 8 Frame 12 Emergency lock mechanism 27 Switching means

Claims (3)

[Claims] Claim: What is claimed is: 1. A rotating body attached to a frame of a take-up reel, a flat rope wound around the rotating body, and an emergency for preventing the flat rope from being pulled out when the flat rope is pulled out at a high speed. A fall prevention device provided with an emergency lock mechanism for maintaining an emergency lock state, comprising a switching means for changing over to a normal state of pulling out the flat rope in which the emergency lock mechanism does not operate. 2. The fall prevention device according to claim 1, further comprising a constant lock means for maintaining a constant lock state for always preventing the flat rope from being pulled out. 3. The switching means and the constant lock means are integrally formed so that the flat rope normal pull-out state, the emergency lock state, and the constant lock state can be selectively obtained. The fall prevention device according to claim 2.