JPH0327215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fall prevention device, and more particularly to a fall prevention device that can be easily attached and detached to a desired height on a lifeline, and that can be lowered intermittently according to the fall load. This invention relates to a fall prevention device that can prevent sudden impacts to workers.

Conventionally, this type of fall prevention device has been used to prevent falls when working at heights at construction sites, bridges, shipbuilding, dam construction, etc., but the present invention is also useful in the event of a fire in high-rise buildings such as buildings, condominiums, hotels, department stores, etc. It is a device that can be safely used with reliable operation for evacuation or mountain climbing, for repairing heavy objects such as machinery and equipment, for preventing falls during demolition, and as a device for lowering heavy objects from high places. This is what I did.

By the way, when using a fall prevention device when working at heights, etc., one end of the safety net is tied to a part of a structure or a fixed upright pole in the work place, and the device is suspended from the safety net. The fall prevention device is attached to the safety net, and an auxiliary rope connects the fall prevention device with the safety belt attached to the worker.In the event of a fall accident, the fall prevention device attached to the safety net is fixed to provide assistance. It is designed to hold the worker suspended in the air via a rope.

However, since conventional fall prevention devices are firmly fixed at an appropriate height on the safety net by pressure from internal springs or centrifugal force notches and fixed levers, the impact force during a fall is The sudden force applied to the belt often caused damage to the worker, and the spring had to be loosened to attach it to the belt at an appropriate height, which was extremely troublesome.

The present invention eliminates the above drawbacks, and has two
A box-shaped cylindrical body assembled by pivoting the two halves in a fan-like manner so that they can be opened and closed; As if inserting the lifenet into the body in an S-shape,
A group of rollers arranged in three middle and lower tiers and consisting of an upper roller and a lower roller having a circular concave central part, which are rotatably provided, and an intermediate roller having circular concave claw teeth on the circumferential surface and a clutch disk formed on the inner end surface. and a roller mounting shaft having a protrusion that faces and engages with the clutch disk of the intermediate roller, and protrusions having a partial trapezoidal cross section at symmetrical positions on the diametrical line on the periphery of the opposite surface. It consists of a movable clutch disc that can slide and rotate, and the movable clutch disc on the intermediate roller mounting axis is engaged with the hook locking part, and the protrusion of the movable clutch disc is normally engaged with one of the parts. Both clutch disks are separated by fitting into locking holes provided at corresponding positions, and the protrusion of the movable clutch disk is pulled out of the locking hole due to the rocking stress of the hook locking portion due to the load. ,
The clutch mechanism is configured to rotate and engage both clutch disks with the brake. When a load is applied to a fall or a heavy object is lowered, the clutch mechanism stops the intermediate roller after intermittent rotation, or gradually slows down the intermediate roller. The frame body can be opened and closed freely,
The claw teeth of the intermediate roller and the S-shaped insertion into the frame of the safety net ensure that the fall prevention device is securely connected to the safety net.
It was made easy.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the structure of the present invention shown in the drawings will be described.

What is shown in FIGS. 1 and 2 is a fall prevention device a according to the present invention, which consists of two separate bodies 1 as shown in the figure.
Three rollers 3, 4, and 5 are arranged in upper, middle, and lower stages so that the life net 2 is inserted into the frame 1 formed by combining the rollers a and 1b in an S-shape, and the intermediate roller 4 is A clutch mechanism 6 that rotates intermittently according to the load of descent, a frame opening/closing mechanism that facilitates the insertion of the lifenet into the device a, and a meshing engagement of the clutch mechanism that locks the hook of the auxiliary rope. It is equipped with a hook locking part etc. for releasing the lock.

The first segment 1a constituting the frame 1 is bent into a U-shape as shown in FIG.
Two mounting shafts 3a and 5a are mounted vertically between them, respectively. The upper mounting shaft 3a rotatably fits an upper roller 3, which will be described later, and the lower mounting shaft 5a rotatably fits the lower roller 5, as shown in FIGS. 1 and 2. This is a shaft on which a hook locking portion 7 for locking an auxiliary rope is swingably attached.

In addition, the second segment 1b is connected to the first segment 1b as shown in FIG.
It is bent into a U-shape of approximately the same size and shape as the segment 1a, and is fitted onto the mounting shaft 4a so that the intermediate roller 4 can be rotated under elastic restraint, as shown in FIG. It has been done. For this purpose, the intermediate roller 4 has a recess 10 formed in the center of one end surface as shown in FIGS. 2 and 7, and a bullet 11 fitted on the mounting shaft 4a.
is compressed and interposed within the recess 10, and the other end surface is engaged with the stepped portion 12 of the mounting shaft 4a. 1st
As shown in the figure, the divided body 1a and the second divided body 1b are provided with pivot parts 13 and 13' projecting from the side plates, respectively, for attaching them to each other in a hinge-like manner.
13' are stacked vertically as shown in FIG. 2, and the pin 14 is inserted into the common hole to assemble. As a result, the first divided body 1a and the second divided body 1b are integrally formed in the frame 1 which can be opened and closed using the hinge pivoting portion as a pivot.
In addition, in order to close both the divided bodies 1a and 1b and fix the frame body 1 in a box-like cylindrical shape, the first divided body 1 is closed as shown in FIG.
A locking part 17 for elastically fitting and holding a locking pin 15 by a spring 16 is provided protruding from the separate side plate, and corresponding to this locking part 17, the second separate part 1b
A fitting hole 1 into which the tip of the locking pin 15 is inserted and locked.
A locking protrusion 19 having a diameter of 8 is provided. As a result, as shown in FIGS. 1 and 2, the first segment 1a and the second
When closing the segments 1b, the pin 15 is moved back against the elasticity of the spring 16, and both segments 1a, 1
When the pins b are closed and released, the pin 15 moves forward and its tip enters the fitting hole 18 of the locking protrusion 19, and the two halves 1a and 1b are closed and fixed.

As described above, the first divided body 1a and the second divided body 1b are
In this case, the upper roller 3, the lower roller 5, and the hook locking part 9 are attached to the first segment 1a in advance, and the intermediate roller 4 is attached to the second segment 1b. and a movable clutch disk 20, which will be described later, are attached. By forming the frame 1, a group of rollers for S-shaped insertion of the lifenet 2 is formed in the frame 1 by the upper, middle, and lower rollers 3, 4, and 5. When inserting the lifenet 2, as shown in Fig. 4, both halves 1a and 1b are expanded and the top, middle,
This can be easily done by inserting the lower rollers 3, 4 and 5 in an S-shape, and after insertion the two parts 1a, 1
Just close b.

As shown in FIG. 2, the upper roller 3 and the lower roller 5 are drum-shaped rollers having an arcuate concave center portion, and the intermediate roller 4 has a plurality of arcuate concave pawls as shown in FIGS. 2 and 7. A roller having teeth 21 formed on its circumferential surface is used, and the vertical distance between these rollers is set so that the distance between the intermediate roller 4 and the upper and lower rollers 3 and 5 at the concave portion is approximately the same as the diameter of the life net 2.

Thus, the concave claw teeth 21 on the surface of the intermediate roller 4 are the seventh
As shown in the figure, the claw teeth are formed, for example, in the shape of a substantially right triangular side. This is a fall prevention device a along the lifenet 2 inserted between the upper, middle, and lower rollers 3, 4, and 5.
When sliding up the intermediate roller 4, the intermediate roller 4 rotates smoothly so that the sliding up can be carried out easily.On the other hand, when the device a slides down, the claw teeth 21 are slightly bitten into the life net 2 and are locked. This is to position the device a on the life net 2 at a desired height by inserting it in an S-shape between the rollers.

A clutch mechanism 6 is constructed using this intermediate roller 4.

That is, as shown in FIGS. 2 and 7, a clutch disk 22 is formed on the inner end surface of the intermediate roller. As shown in the figure, the clutch disk 22 has a plurality of trapezoidal convex portions 23 arranged radially evenly on its surface with a trough portion 24 in between. On the other hand, as shown in FIGS. 2 and 8, a movable clutch disk 20 having the same shape, the same size, and the same number of convex portions 23' that engages with the clutch disk 22 of the intermediate roller 4 is connected to the intermediate roller 4. Second split 1
It is loosely fitted onto the mounting shaft 4a between the side plate b and the mounting shaft 4a so as to be rotatable and slidable. Further, as shown in FIG. 8, this clutch disk 20 is provided with a locking piece 25 projecting into the recess 24' on a part of its periphery, and two protrusions each having a trapezoidal cross section on the periphery of the opposite surface from the clutch surface. Child 2
6, 26 into the recess 24' corresponding to the locking piece 25.
protrudingly provided at symmetrical positions on the diametrical line at the adjacent convex portion 23'. Two protrusions 2 of the clutch disc 20
Two locking holes 27, 27 into which the locking holes 6, 26 are inserted are provided at corresponding positions in the side plate 28 of the second dividing plate 1b. As a result, the protrusions 26, 26 are fitted into the locking holes 27, 27, and in this state, the movable clutch disc 20 is separated from the intermediate roller 4, and the clutch disc 20 is separated from the intermediate roller 4.
2 and not engaged. The intermediate roller 4 is pressed by the bullet 11 so as to move toward the movable clutch disk 20, but since the stepped portion 12 of the mounting shaft 4a serves as a stopper, it cannot move any further toward the movable clutch disk 20. Also, movable clutch 2
Since the movable clutch 20 is locked by frictional engagement with a large diameter portion of the step portion 12 or a hook locking portion to be described later, the movable clutch 20 can be easily maintained in a released state. Further, the hook locking portion 9 loosely attached to the mounting shaft 5a of the lower roller 5 is attached to the side plates 2 as shown in FIG.
A locking part 31 is fixed to the lower part of each plate 9, 30 to form a U-shape, and both side plates 29, 30 are loosely fitted to the mounting shaft 5a as shown in FIGS. 2 and 3, so that they can swing freely. However, as shown in the figure, one side plate 29 is formed with a recess 32 into which the locking piece 25 of the movable clutch 20 is fitted and locked. As a result, the movable clutch disk 20 is released from the clutch disk 22 of the intermediate roller 4, and the protrusions 26, 26 of the movable clutch disk 20 are fitted into the locking holes 27, 27 of the second segment 1b, as shown in FIGS. As shown in FIG. 3, with the locking piece 16 of the movable clutch disk 20 fitted into the recess 32 of the hook locking portion 9, the movable clutch disk 20 is moved toward the lower roller as shown by the chain line in the same figure. The movable clutch disk 20 and the hook locking portion 9 are engaged with each other so that the movable clutch disc 20 stands still in an inclined state with the mounting shaft 5a as a support shaft. When a load is applied to the hook locking portion 9, the locking portion 9 tends to become vertical, and as a result, the movable clutch disc 2
0 is the locking piece 25 and the recess 32 of the hook locking part 9
The protrusions 26, 26 having a trapezoidal cross section of the movable clutch disk 20 are pulled out from the locking holes 27, 27 of the second segment 1b due to the rotational stress caused by the fitting and locking with the side plate 28.
It slides into contact with the inner surface and comes to rest. Accordingly, the movable clutch disk 20 is pushed inward, and the clutch disk 20 of the intermediate roller 4 is held in a fixed state by the locking piece 25 of the movable clutch disk 20 being fitted into the recess 32 of the hook locking portion 9.
engage with. In this case, the intermediate roller 4 can be moved along the threaded portion 33 of the mounting shaft 4a by rotating the mounting shaft 4a, so that the clutch circle of the intermediate roller 4 can be adjusted by elastically adjusting the bullet 11 fitted to the mounting shaft 4a. Board 22
The engagement pressure of the movable clutch disk 20 can be adjusted. As described above, the clutch mechanism 6 is constituted by the clutch disk 22 of the intermediate roller 4, the movable clutch disk 20, and the hook locking portion 9 related to the sliding movement of the movable clutch disk 20.

When the intermediate roller 4 is rotated in the engaged state of both the clutch discs 20 and 22, the convex part 23 of the clutch disc 22 is engaged with the locking piece 25 and the recess 32, so that the intermediate roller 4 is rotated. It passes over the convex portion 23' of the movable clutch disc 20 and enters the trough 24', and the intermediate roller 4 repeats this process and rotates intermittently.

As described above, the intermediate roller 4 is connected to the clutch disk 20.
In this case, the height of the protrusions 23, 23', the angle θ of the sloped side surface of the trapezoidal chevron shape, and the engagement pressure contact between both clutch discs 20, 22 by the bullet 11 are determined. Depending on the magnitude of the force, the resistance to cross over the convex portion varies in magnitude.

This protrusion crossing resistance is related to the rotational driving force of the intermediate roller, so if the driving force is made larger than the protrusion crossing resistance and the intermediate roller is rotated, the intermediate roller rotates intermittently, and the driving force becomes the resistance force. If it is the same or smaller, the roller will stop with the protrusion fitted into the trough of the mating fixed clutch disc.

The present invention uses the clutch mechanism described above to rotate the intermediate roller intermittently, and then stops after a plurality of intermittent rotations, thereby alleviating the impact of a fall.Furthermore, when lowering an article from a high place, the intermediate roller is gradually lowered to the ground. That's what I do.

Therefore, the initial rotational driving force of the intermittent rotation of the intermediate roller 4 is combined with the pressing force of both clutch disks 20 and 22 due to the pressing force of the elastic machine 11 and the inclination angle θ of the convex portion 23.
The mounting shaft 4a is screwed to adjust the pressing force of the bullet 11 so as to make it slightly larger than the overcoming resistance force determined in relation to the above, and to obtain a predetermined descending state, and the clutch engaging force is adjusted. Set as specified. It should be noted that the pressing force of both clutch disks 20 and 22 is expressed by the ammunition 11.
It is convenient to display the scale 34 calculated in relation to the pressing force as shown in FIG.

Next, how to use the fall prevention device configured as above will be explained for high-place work.

First, a first part 1a has an upper roller 3, a lower roller 5, and a hook locking part 9 mounted on the upper and lower mounting shafts 3a, 5a, and a second part 1a has an intermediate roller 4 and a clutch mechanism 6 mounted on the mounting shaft 4a. As shown in FIG. 4, the body 1a is expanded using the pivot parts 13 and 13' as fulcrums, and the life net 2 is inserted between each roller in an S-shape, and the tip of the life net 2 is attached to a support or the like. conclude. Next, the first segment 1a and the second segment 1b are closed, and the locking pin 15 of the first segment 1a is inserted into the insertion hole 13 of the second segment 1b.
and insert both halves 1a and 1b into the box-shaped cylindrical frame 1.
and attach it to life net 2.

Further, when the first segment 1a and the second segment 1b are closed, the two protrusions 2 of the movable clutch disc 20
6 and 26 into the locking holes 27 and 27 of the second segment 1b. As a result, the movable clutch disc 20 is separated from the clutch disc 22 of the intermediate roller 4, and the clutch is not engaged. It is held tilted about the mounting shaft 5a as a fulcrum. Also,
The intermediate roller 4 is restrained by the pressing force of the bomb 11, but is rotatable, so that the fall prevention device a can freely move up and down along the lifeline 2 and come to rest at an appropriate height. The life net 2 is inserted between the rollers in an S-shape, and the circumferential surface of the intermediate roller 4 has concave claw teeth 21.
Therefore, the device a is held at a predetermined height by these locking actions.

Now, when a fall occurs, the load applied to the fall prevention device via the auxiliary rope is applied directly to the hook locking portion 9, and the hook locking portion 9, which is held at an angle, swings and becomes vertical. Along with this, the movable clutch disk 20 that is locked with the hook locking part 9 rotates, and the protrusions 26, 26 of this are pulled out from the locking holes 27, 27, and the side plate of the second segment 1b is rotated. 28, the movable clutch disk 20 is pushed inward and elastically presses against the clutch disk 20 of the intermediate roller 4 to engage the clutch. Since the movable clutch disk 20 engages with the hook locking portion 9 which is vertically stationary due to the load, it does not rotate, and therefore the intermediate roller 4 is also fixed. As described above, in a state in which the clutch disc 22 of the intermediate roller 4 and the movable clutch disc 20 are clutch-engaged due to the load at the time of a fall, this clutch mechanism is operated so that the intermediate roller 4 performs appropriate intermittent rotation. .

Therefore, in the fixed clutch mechanism engaged as described above, the heights of the convex portions 23, 23' of both clutch disks 20, 22 and the angle θ of the trapezoidal sloped side surfaces are constant. As shown in the figure, in relation to the above-mentioned angle (θ), the acting force A that drives the intermediate roller 4 over the convex portion and overcoming the rotational resistance is the pressing force P of the bullet 11, where A=Ptanθ. Therefore, the pressing force P of the ammunition 11 is set so that this working force (A) slightly overcomes the working force of Ptanθ.

The load applied to the fall prevention device through the auxiliary rope due to a fall is expressed as the rotational driving force of the intermediate roller, so as mentioned above, the pressing force P of the projectile is measured at scale 34.
By setting the adjustable intermediate mounting shaft 4a by looking at Sequentially decreasing A=
Ptan θ, and the intermediate roller either stops after intermittent rotation several times or rotates slowly.

As a result, the fall prevention device a descends step by step along the lifeline 2 at the time of a fall, so the sudden impact of the fall is alleviated and damage to the worker is prevented.

The above embodiment is an example in which the fall prevention device is used in a high-altitude workplace, but the fall prevention device of the present invention has a size, a pressing force of the projectile, and a convex portion of the clutch mechanism depending on the working conditions at the place of use. It is used in the same way for bridges, shipbuilding, dam construction, fire evacuation in high-rise buildings, mountain climbing, and equipment for transporting heavy objects. For example, when used for evacuation, a safety net is stretched vertically or diagonally from a high place to the ground, and a fall prevention device is lowered almost continuously and slowly so that evacuees can safely descend to the ground. For this purpose, the elastic pressure of the clutch mechanism is adjusted to such an extent that the intermediate roller rotates slowly.

As explained above, the present invention includes a frame body in which two parts are pivotally connected so as to be openable and closable and assembled into a box-shaped cylindrical body, and a frame body in which a hook locking part of an auxiliary rope is swingably provided at the lower part of this body; The life net is inserted into the frame in an S-shape, and is arranged in upper, middle, and lower three stages, and is rotatably provided with an upper roller and a lower roller having an arcuate concave shape in the center, and an arcuate claw tooth on the circumference. , a roller group consisting of an intermediate roller having a clutch disk formed on its inner end surface;
The clutch mechanism includes a movable clutch disc that can slide and rotate on the roller mounting shaft, facing the clutch disc of the intermediate roller, and performs a braking action. The two clutch disks are normally separated by engaging with the locking portion, and the hook locking portion oscillates and stops due to the load, and the two clutch disks are engaged with an adjustable pressure force. With the frame body pivoted so that it can be opened and closed, the life net can be expanded and easily inserted from below between the rollers attached to the frame body in an S-shape, so this device can be attached to the life net. It is simple and easy to carry out, and the intermediate roller of this device has a circumferential surface shaped like a concave pawl.
In addition, since the clutch mechanism allows the intermediate roller to rotate without the clutch being engaged at all times, the lifting along the lifeline can be done smoothly by rotating the intermediate roller.
On the other hand, when the device is lowered, the claw teeth engage the life net, so that the device can be reliably and easily installed at the desired height.

Furthermore, according to the present invention, the engagement of the clutch mechanism is performed simultaneously with the vertical swinging of the hook locking portion due to the load at the time of the fall, and the intermediate roller is intermittently rotated as the fall occurs.
In addition, since the engagement force of the clutch mechanism can be adjusted by the bullet, the intermittent rotation of the intermediate roller due to a fall can be prevented to the extent that the first intermittent rotation is made smoothly against the pressing force of the clutch disc by the bullet. By adjusting the pressing force of the machine, the rotation can be made so that the intermediate roller stops after multiple intermittent rotations depending on the load at the time of a fall, or the rotation speed becomes gradually slower when used for lowering articles, etc. This makes it possible to easily alleviate the sudden impact that conventionally occurs, completely eliminate damage to workers, and make it possible to safely descend objects, personnel, etc.

The fall prevention device according to the present invention can be easily made for a wide range of purposes such as work at heights, evacuation in case of fire in high-rise buildings, mountain climbing, unloading and transporting heavy objects, etc., and is extremely safe and convenient. It can be used for.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view thereof, Fig. 2 is a side view showing a longitudinal section of the main part, and Fig. 3 is a diagram showing the engagement of the movable clutch disk and the hook locking part. 4 is a plan view of the frame in an expanded state; FIG. 5 is a perspective view of the first segment of the frame; FIG. 6 is a perspective view of the second segment of the frame; Fig. 7 shows an intermediate roller, Fig. A is a partially enlarged cross-section of the concave claw teeth and clutch disk, and is a front view showing the clutch acting force, Fig. B is a vertical side view, and Fig. 7 is a longitudinal side view. 8
The figure shows a movable clutch disk, of which figure A is a front view showing an enlarged cross-sectional view of a part thereof, figure B is a vertical side view, figure C is a plan view, and figure 9 is a hook locking part. , the A figure is a front view and the B figure is a side view. DESCRIPTION OF SYMBOLS 1... Frame body, 1a, 1b... Frame body division, 3... Upper roller, 4... Intermediate roller, 5... Lower roller, 3
a, 4a, 5a... Roller mounting shaft, 6... Clutch mechanism, 9... Hook locking portion, 20, 22... Clutch disc, 21... Arc concave claw tooth.

Claims (1)

[Claims] 1. A box-shaped cylindrical body assembled by pivoting two parts so as to be openable and closable, a hook locking part of an auxiliary rope swingably installed across the lower parts of the two parts, and a hook locking part inside the cylinder. Insert the lifenet in an S-shape with the top, middle,
A roller group arranged in the lower three stages and consisting of an upper roller and a lower roller having a circular concave center part and a rotatably provided intermediate roller, and an intermediate roller having a circular concave pawl tooth on the circumferential surface and a clutch disk formed on the inner end surface; a protrusion that faces and engages with the clutch disc of the intermediate roller, and slides on a roller mounting shaft that has a pair of protrusions having a trapezoidal cross section at symmetrical positions on the diametrical line on the periphery of the opposite surface; Consists of a rotatable movable clutch disc,
The movable clutch disc on the intermediate roller mounting axis is engaged with the hook locking part, and normally the protrusions of the movable clutch disc are fitted into the locking holes provided at the corresponding positions on one of the parts, and both clutches are connected. The disks are separated, and the protrusion of the movable clutch disk pulls out of the locking hole and rotates due to the rocking stress of the hook locking part due to the load, causing both clutch disks to engage with the brake. A fall prevention device characterized by comprising: