JP5266129B2 - Safety device for fall prevention - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the noise of rollers, to improve the cushioning property, and to improve the abrasion resistance of the rollers and a horizontal rail, during running while securing the electroconductivity of the respective rollers. <P>SOLUTION: The fall preventive safety device 17 is disposed and fixed to a structure, and freely moves in a guide groove 7 of a cylindrical horizontal rail 9 having the guide groove 7 along an opening 5 in the longitudinal direction of its lower surface, and a fall preventive member 29 including a safety harness 27 can be connected thereto. The fall preventive safety device 17 is composed of: a safety device body 19 which moves the opening 5; the plurality of rollers 21 rotatably attached to the upper part of the safety device body 19 to run within the guide groove 7; and a connection part 31 disposed in the lower part of the safety device body 19 so that the fall preventive member 29 can be connected thereto. Each roller 21 is composed of an annular roller body 41 and a buffer member 43 disposed on the outer surface of the roller body 41. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a fall-preventing safety device, in particular, prevention of fall accidents when working at high altitudes, and prevention of explosion accidents caused by sparks caused by static electricity generated from workers' clothes during work, etc. igniting combustible materials. The present invention relates to a safety device for fall prevention in a fall prevention device considering the above.

  Conventionally, the prevention of fall caused by preventing fall accidents when working at high altitudes, and preventing explosion accidents caused by ignition of combustibles by sparks caused mainly by the static electricity of workers during work on combustibles As shown in Patent Document 1, the apparatus has a cylindrical shape in which a linear opening is provided in the length direction of the lower surface of a structure positioned above the stop position of a combustible material loaded vehicle (tank lorry). The horizontal rail is fixedly arranged by a rail gripping bracket. The horizontal rail is provided with a moving member (corresponding to the above-mentioned “fall prevention safety device”) that freely travels (moves) in guide grooves provided along both sides of the opening. In the ring portion, a centrifugal clutch mechanism is incorporated, and a strap winder that allows a belt of a predetermined length (corresponding to a “strap”) to be pulled out and stored is connected.

  When an operator refuels a combustible material-carrying vehicle at a relay gas station and inspects a combustible material-carrying vehicle, the operator's safety belt is connected to the fastener at the tip of the strap winder belt, It is possible to prevent the operator from falling. Moreover, conductive fibers are used for the clothes of the workers, and conductive fibers are woven into the belts of the safety belt and the strap winder, and the main parts of the hook, strap winder and moving member are made of copper, By discharging static electricity charged to the worker from the structure to the ground, ignition (explosion) due to static electricity can be prevented.

JP 2004-97562 A

  By the way, in the conventional fall prevention device described in Patent Document 1, two pairs of rollers are rotatably provided on the moving member, and the moving member is connected to the horizontal rail via the two pairs of rollers. It is configured to freely move in the guide groove. Since the horizontal rail is made of aluminum and each roller is made of copper such as brass, the electrical conductivity of the horizontal rail and the roller is good. However, when the two pairs of rollers run in the guide groove of the horizontal rail, the rollers and the horizontal rail are made of metal, so that noise is generated by the contact between the rollers and the horizontal rail, and the work site is close to a house. In some cases, complaints of noise from nearby residents occurred. Furthermore, since the roller and the horizontal rail are made of metal, the wear of the two pairs of rollers and the guide rails of the horizontal rail was severe (large).

  It is an object of the present invention to prevent noise during running of the rollers, improve cushioning properties, and improve the wear resistance of the rollers and horizontal rails while ensuring the conductivity of each roller.

The invention according to claim 1 is arranged and fixed to the structure, and freely moves in the guide groove of the cylindrical horizontal rail provided with the guide groove along the opening provided in the length direction of the lower surface, In addition, in the safety device for fall prevention to which a safety member including a safety belt can be connected, the safety device body that moves through the opening, and the upper part of the safety device body that is rotatable to travel in the guide groove. A plurality of rollers provided, and a connecting portion provided at a lower portion of the safety device main body so that the fall prevention member can be connected, and each of the rollers includes an annular roller main body, It is composed of an elastic rubber or resin buffer member provided on the outer periphery, and the buffer member extends so as to cover the outer peripheral parts of both side surfaces of the roller body, and the safety device body, the roller body, Connecting part and said loose The member has electrical conductivity, an uneven portion is provided on the outer peripheral surface of the roller body, the buffer member covers the uneven portion, fits into the uneven portion, and is outside the outer peripheral surface of the uneven portion. The rubber member has a wall thickness, and the buffer member is elastic rubber, and is configured to be separable from the roller body by heating to 30 ° C. or higher .

According to a second aspect of the invention, the fall prevention safety device according to claim 1, wherein said cushioning member is formed integrally with the roller body.

  According to the first aspect of the present invention, each roller is composed of an annular roller body and a buffer member made of elastic rubber or resin provided on the outer periphery of the roller body. It is possible to improve noise prevention during running of the roller and wear resistance of the roller and the horizontal rail. Further, since the roller has an elastic buffer member on the outer periphery of the roller body, the impact that the roller receives from the horizontal rail is reduced, and the impact on the operator is also reduced.

In addition, since the buffer member covers the side surface of the roller body, when the roller is inclined and travels to contact the horizontal rail, the buffer member contacts the horizontal rail and the roller body does not contact the horizontal rail. Noise during running of the roller can be prevented. Further, since the buffer member covers the side surface of the roller body, even if the roller contacts the horizontal rail, the impact received by the roller is reduced and the impact on the operator is also reduced.

In addition, since the safety device main body, the roller main body, the connecting portion, and the buffer member have conductivity, the safety device main body, the roller main body, the connecting portion, and the buffer member are used as current paths for leaking static electricity charged to the worker. be able to.

In addition, since the uneven portion is provided on the outer peripheral surface of the roller body, the buffer member covers the uneven portion, and has a thickness outside the outer peripheral surface of the uneven portion, the buffer member is worn and the roller main body is worn. When the outer peripheral surface is exposed, the wear state of the buffer member can be easily determined visually. Further, when the shock absorbing member is worn and the outer peripheral surface of the roller body is exposed, the running sound of the roller changes, so that the wear state of the shock absorbing member can be easily determined. Furthermore, since the buffer member is fitted to the concavo-convex portion, the buffer member is unlikely to come off from the roller body in the axial direction of the roller body, and the function of the buffer member can be maintained.

In addition, since the buffer member is elastic rubber and is configured to be separable from the roller body by heating to 30 ° C. or higher, when the buffer member is worn, only the buffer member is replaced without replacing the entire roller. it is sufficient to exchange, Ru can reduce the maintenance costs at a low cost.

According to the invention described in claim 2, cushioning member Gallo over la body than that are integrally molded, the number of parts is reduced, that an easy to assemble.

1 is a schematic perspective view of a fall prevention safety device and a fall prevention device using the fall prevention safety device according to an embodiment of the present invention. It is state explanatory drawing which uses the fall prevention apparatus of embodiment of this invention. It is a perspective view of the horizontal rail in the fall prevention device of an embodiment of this invention. It is an assembly exploded perspective view showing a partial section of a roller. It is a longitudinal cross-sectional view of the roller of embodiment of this invention. It is the graph which showed the relationship between the time which performed the static load test using the roller of an Example and a comparative example, and tensile strength. It is a longitudinal cross-sectional view which shows other embodiment of a roller. It is a perspective view which shows other embodiment of the uneven | corrugated shape of the outer peripheral surface of a roller main body. It is a perspective view which shows other embodiment of the uneven | corrugated shape of the outer peripheral surface of a roller main body. It is a perspective view which shows other embodiment of the uneven | corrugated shape of the outer peripheral surface of a roller main body. It is a longitudinal cross-sectional view which shows the fundamental structure of a roller. It is sectional drawing of the fall prevention device using the safety device for fall prevention of other embodiment of this invention, and the safety device for fall prevention. It is a perspective view of the drum of a strap winder. It is a front view of a safety belt. It is a rear view of a safety belt. It is a front view which shows the use condition of the fall prevention apparatus of embodiment of this invention. It is a side view which shows the use condition of the fall prevention apparatus of embodiment of this invention.

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

  Referring to FIGS. 1 to 3, the crash prevention device 1 according to this embodiment prevents falling accidents during work at high places and prevents ignition (explosion) accidents caused by static electricity charged by workers during work. It is taken into consideration.

  For example, as shown in FIG. 16 and FIG. 17, an opening 5 (see FIG. 5) that continuously opens linearly in the length direction of the lower surface is provided above the stop position of the combustible material loading vehicle 3 (tank lorry). 1), cylindrical horizontal rails 9 having guide grooves 7 (see FIG. 1) arranged on both sides thereof are fixedly arranged on the structure by rail gripping fittings 11. The horizontal rail 9 is obtained by pultrusion molding or extrusion molding such as a conductive aluminum alloy. As shown in FIG. 3, the horizontal rail 9 can be connected to a plurality of single rails by joint fittings 13. The horizontal rail 9 is provided with a fall prevention safety device 17 which will be described later in detail so as to freely move in the guide groove 7. Stopper stoppers 15 for preventing the fall-off safety device 17 are provided at both ends of the horizontal rail 9.

  As shown in FIG. 1, the safety device for fall prevention 17 of this embodiment has a safety device main body 19, and the safety device main body 19 is made of a conductive metal. In this embodiment, the safety device 17 is conductive. It is made of good copper and other copper and has an inverted triangular shape that squeezes downward. As shown in FIG. 4, on the upper part of the inverted triangular safety device main body 19, two pairs of rollers 21 running in the guide groove 7 are fixed to the safety device main body 19 and have a conductive support shaft. 23 is rotatably provided via a bearing 25 having conductivity. The roller 21 is fastened to the support shaft 23 by a fastener 21A that is fixed to the tip of the support shaft 23. Accordingly, the two pairs of rollers 21 travel in the guide groove 7 with the lower part of the inverted triangular safety device main body 19 projecting downward from the opening 5 of the horizontal rail 9, so that the safety device 17 for preventing the fall is provided. It is possible to travel along the horizontal rail 9.

  Further, a fall prevention member 29 (see FIG. 2) including a safety belt 27 for preventing the operator from falling is connected to the lower part of the safety device main body 19 projecting downward from the lower surface of the horizontal rail 9. A connecting hole 31 (see FIG. 1) is provided as a connecting portion.

  As shown in FIG. 2, the fall prevention member 29 includes a strap winder 33, and a locking hook 37 (conductive) as a locking tool at the tip of the strap 35 of the strap winder 33. A lanyard 39 connected via the lanyard 39, a safety belt 27 connected to the lanyard 39, and a connecting metal fitting such as a hook for connecting the members.

  4 and 5 together, each roller 21 includes an annular roller body 41 and an elastic conductive rubber or conductive material integrally formed on the outer periphery of the roller body 41 by insert molding. And a conductive buffer member 43 made of a conductive resin. The roller body 41 is made of copper such as brass having good conductivity. Examples of the conductive rubber include conductive silicone rubber, natural rubber-based conductive rubber, chloroprene rubber-based conductive rubber, nitrile rubber-based conductive rubber, and other forms of conductive rubber. Examples of the conductive resin include ABS permanent antistatic resin, conductive compound, potassium titanate fiber synthetic resin, various carbon fiber-containing resins, and other forms of conductive resins.

  Therefore, when the two pairs of rollers 21 of the fall-preventing safety device 17 travel in the guide groove 7 of the horizontal rail 9, the running noise of the roller 21 is reduced by the conductive buffer member 43, and the roller 21 and the horizontal rail 9 Abrasion resistance is improved. Further, since the roller 21 has the conductive buffer member 43 on the outer periphery of the roller body 41, the impact that the roller 21 receives from the horizontal rail 9 is reduced, and the impact on the operator is also reduced. Moreover, since each roller 21 has favorable electroconductivity as a whole, each roller 21 can be used as an energization path for leaking static electricity charged to an operator. In addition, since the conductive buffer member 43 is integrally formed on the outer periphery of the roller body 41, the number of parts is reduced and the assembly is facilitated.

  In order to improve the adhesion between the conductive buffer member 43 and the roller main body 41, the outer peripheral surface of the roller main body 41 has an uneven shape, that is, an uneven portion is provided on the outer peripheral surface of the roller main body 41, and the conductive buffer member 43 is provided. It is desirable to fit the concavo-convex portion.

  As shown in FIG. 5, each roller 21 of this embodiment is provided with a dovetail groove 45 as an uneven shape on the outer peripheral surface of the roller body 41, and the conductive buffer member 43 covers the dovetail groove 45. In addition, it is configured to fit into the dovetail groove 45 and to have a wall thickness outside the outer peripheral surface of the dovetail groove 45. Furthermore, since the dovetail groove 45 has a wedge-shaped taper that expands toward the inside (inner circumference), the adhesion between the conductive buffer member 43 and the roller body 41 is further improved.

  In the case of the roller 21 of this embodiment, the adhesion between the conductive buffer member 43 and the dovetail groove 45 of the roller main body 41 is further improved, so that the conductive buffer member 43 is moved from the roller main body 41 to the roller main body 41. It becomes difficult to come off in the axial direction, and the function of the conductive buffer member 43 can be maintained.

  Usually, since the roller 21 is hidden inside the horizontal rail 9, the wear state of the conductive buffer member 43 cannot be determined unless the inside of the horizontal rail 9 is viewed. And since the horizontal rail 9 is installed in the high place, it is not easy to check the abrasion state of the electroconductive buffer member 43. However, when the conductive buffer member 43 decreases due to wear and the outer peripheral surface of the dovetail groove 45 is exposed, the outer peripheral surface of the dovetail groove 45 contacts the guide groove 7 and rotates when the roller 21 travels in the guide groove 7. Therefore, the running sound changes greatly, so that the wear state of the conductive buffer member 43 can be easily determined. Moreover, although the dovetail groove 45 can easily determine a change in running sound based on the exposure, it is desirable in that an extremely loud sound is not generated because the exposed area is small. Further, since the conductive buffer member 43 is reduced due to wear and the outer peripheral surface of the dovetail groove 45 is exposed, the conductive buffer member 43 is taken out by taking out the roller 21 (the fall-preventing safety device 17) from the horizontal rail 9. The wear state can be easily determined visually.

  In this embodiment, the conductive buffer member 43 has an outer diameter of, for example, about 40 mm, a width of, for example, about 14 mm, a thickness of, for example, about 4 mm, and a dovetail groove 45 height (depth) of, for example, about 2 mm. Therefore, the thickness of the conductive buffer member 43 outside the outer peripheral surface of the dovetail groove 45 is about 2 mm. Incidentally, the conventional replacement standard of the roller 21 due to general wear is that the wear amount of the diameter is 1.0 mm, or the preset service life is 6 years.

  Here, the fall prevention safety device 17 using the roller 21 is used as an example, the fall prevention safety device using a conventional brass roller is used as a comparison example, and the fall prevention safety device of the embodiment and the comparison example is used. A running test of the container, that is, a sliding test for measuring the wear resistance of the roller, a noise and a static load test were performed.

  (1) As a sliding test method, a safety device for fall prevention is set on the horizontal rail 9, the moving amount is 1 m in a reciprocating motion once (that is, the moving amount is 2 m), and the speed is 20 times / minute. Then, it was reciprocated 100,000 times. That is, the amount of wear of the roller was measured after sliding 200,000 m (meter). The diameter of the roller before the test is 40 mm. The results are as shown in Table 1.

  As can be seen from Table 1, since the diameter of the roller after the test is 39.7 mm in the examples, the roller 21 after sliding of 200,000 m (meter) is 0.3 mm in diameter (0.15 mm in radius). The amount of wear was. Considering that the travel amount per year is about 100,000 m (meters) in general work, this sliding test corresponds to about two years. Accordingly, in the embodiment, the amount of wear for one year is 0.15 mm in diameter (0.075 mm in radius), so that the service life is 1.0 mm, which is the wear amount of the diameter of the replacement reference of the roller 21. Is about 6.6 years (1.0 mm / 0.15 mm).

  On the other hand, in the comparative example, since the diameter of the roller after the test was 39.8 mm, the roller after sliding of 200,000 m (meter) had a wear amount of 0.2 mm in diameter (0.1 mm in radius). . When calculated in the same manner as in the above embodiment, the service life of the roller is about 10 years (1.0 mm / 0.1 mm).

  From the above, the working example is not comparable to the comparative example of the brass roller in terms of the service life alone, but has an abrasion resistance sufficiently satisfying the replacement standard for a service life of 6 years and is 200,000 m (meters). Even when traveling, the difference was only 0.1 mm in diameter when compared with the comparative example. Moreover, it is excellent in that the problem of noise of conventional brass rollers can be solved.

  (2) For the noise test, set the safety device for fall prevention on the 4 m horizontal rail 9 and set the sound level meter directly below the center point of the horizontal rail 9. Then, the harness is attached and the fall prevention member 29 is connected to the fall prevention safety device as shown in FIG. The roller is reciprocated 3 times at a speed of 4 km / h on a 4 m horizontal rail 9. The sound generated at that time was measured at three points: an average value, a maximum value, and a minimum value. The results are as shown in Table 2.

  As can be seen from Table 2, it was confirmed that the average value was 20.1 dB and the maximum value was 17.8 dB. In addition, it was confirmed that the roller 21 of the example had few resonances that did not appear in the direct measurement, and there was almost no sound remaining on the horizontal rail 9 after running.

  (3) As a static load test, the roller specimens of Examples and Comparative Examples were set in a static load tester, and the static load was applied to the specimens in accordance with the test method of the safety belt structure guideline. . The results of measuring the time when the tensile load reached 8 kN and 11.5 kN are as shown in Table 3 and FIG.

  As can be seen from Table 3, until the static load of 8 kN is reached, the roller 21 of the embodiment has a load absorption performance of 32.2%, and until the static load of 11.5 kN is reached, the roller 21 of the embodiment has 32 A result showing a load absorption performance of 2% was obtained.

  Further, as can be seen from FIG. 6, at the time of 8 kN, in the static load, the arrival time is as slow as about 15.5 seconds, which is calculated to absorb 47% of the impact. Similarly, at the time of 11.5 kN, the arrival time is as slow as about 20 seconds in the static load, and this is also calculated to absorb 47% of the impact.

  Actually, since it is difficult to measure the wear state of the roller 21, the roller 21 is replaced with a preset service life of 6 years as described above. However, in this embodiment, since the thickness outside the outer peripheral surface of the dovetail groove 45 of the conductive buffer member 43 is 2 mm, that is, the diameter is 4 mm, the service life is 6 years for some reason. If the conductive buffer member 43 is worn until it reaches the outer peripheral surface of the dovetail groove 45, the running sound of the roller 21 changes greatly. Therefore, the change in running noise is used as a guide for replacing the roller 21. be able to.

  As another embodiment of the roller 21, as shown in FIGS. 7 and 8, the uneven shape 47 on the outer peripheral surface of the roller main body 41 has a tooth shape with a plurality of uneven portions and the outer periphery. You may form continuously over the perimeter of a direction. Alternatively, as shown in FIG. 9, the uneven shape 47 on the outer peripheral surface of the roller body 41 may be formed so that a large number of convex portions are provided on the entire outer peripheral surface. Alternatively, as shown in FIG. 10, the uneven shape 47 on the outer peripheral surface of the roller main body 41 may be continuously formed over the entire periphery in the outer peripheral direction with one convex cross section. Alternatively, other various forms of uneven shapes can be formed.

  In addition, as shown in FIG. 11, the basic configuration of each roller 21 of this embodiment is that the conductive buffer member 43 is integrally formed on the outer periphery of the roller body 41 by, for example, insert molding. It is a configuration. At this time, the outer peripheral surface of the roller main body 41 can be formed as a concavo-convex shape 47 including the dovetail groove 45 as described above, or a simple smooth surface.

  In the above-described embodiment, the conductive buffer member 43 is integrally formed on the outer periphery of the roller main body 41 by insert molding. However, as another embodiment, the conductive buffer member 43 is a roller main body. Since it may be a form that fits tightly on the outer periphery of 41, it is not limited to insert molding. The conductive buffer member 43 fitted on the outer periphery of the roller main body 41 can be separated (replaced) from the roller main body 41 by, for example, heating to 30 ° C. or more to increase the deformation capability. When the shock-absorbing member 43 is worn, it is only necessary to replace the conductive shock-absorbing member 43 without replacing the entire roller 21, and the maintenance cost can be reduced.

  Further, as another embodiment of the fall preventing device 1, as shown in FIG. 12, the conductive buffer member 43 is disposed on the roller main body 41 so that the roller main body 41 does not directly contact the horizontal rail 9, that is, as shown in FIG. You may extend so that the outer peripheral part of both sides | surfaces may be covered.

  As described above, when the conductive buffer member 43 extends from the outer peripheral surface of the roller main body 41 to the outer peripheral portions of both side surfaces of the roller main body 41 and covers both side surfaces of the roller main body 41, the roller 21 is inclined and travels horizontally. Even if it contacts the rail 9, the roller main body 41 does not contact the horizontal rail 9, so that it is possible to prevent noise when the roller 21 travels. Moreover, since the conductive buffer member 43 covers both side surfaces of the roller main body 41, even if the roller 21 comes into contact with the horizontal rail 9, the impact received by the roller 21 is reduced and the impact on the operator is also reduced. . Furthermore, since the uneven shape 47 is provided on the outer peripheral surface of the roller body 41, the adhesion between the conductive buffer member 43 and the uneven shape 47 of the roller body 41 is further improved. Therefore, the conductive buffer member 43 contacts the horizontal rail 9, and the contact portion of the conductive buffer member 43 with the horizontal rail 9 is deformed, and the deformation is transmitted to the outer peripheral portion of the roller body 41 of the conductive buffer member 43. However, the conductive buffer member 43 does not come off from the roller body 41, and the intended purpose can be achieved.

  Referring again to FIG. 1, for example, an upper U-shaped metal fitting 49 </ b> A and a lower U-shaped metal fitting 49 </ b> B are connected to the lower connecting hole 31 of the safety device main body 19 so as to be rotatable in the horizontal direction. The strap winder 33 is connected via a connecting metal fitting 49. The strap winder 33 has a built-in centrifugal clutch mechanism, and a strap 35 having a predetermined length can be pulled out and stored freely.

  Referring to FIG. 13 in more detail, the strap winder 33 is obtained by winding a narrow woven strap 35 made of synthetic fiber around a drum 51, and a winding spring (not shown) is wound around the drum 51. By arranging and continuously energizing the strap 35 with the winding force, the strap 35 can follow the operator's vertical movement without the strap 35 hanging down.

  Further, a centrifugal claw 53 for stopping the rotation of the drum 51 is attached to the drum 51. For example, when the strap 35 is suddenly pulled out, the drum 51 suddenly rotates, and the centrifugal claw 53 is opened by the centrifugal force to come into contact with a stopper (not shown) provided on the conductive cover 55 to prevent the drum 51 from rotating. To do. This prevents the further narrow strap 35 from being fed out. Thereby, the fall distance of an operator is also short and the impact load given to an operator becomes small.

  Further, the above-described connecting metal 49, the connecting U-shaped ring 57 for connecting the strap winder 33 to the connecting metal 49, the centrifugal claw 53, and the stopper are made of copper such as brass, so that no spark due to metal contact is generated. Is. Further, the narrow-width woven strap 35 made of synthetic fiber can leak static electricity charged by weaving conductive fibers to the outside of the machine. Therefore, no spark is generated due to static electricity.

  Referring to FIGS. 14 and 15, an example of the safety belt 27 is shown and is called a harness-type safety belt. In this embodiment, the ring (D ring) 59 and the buckle 61 are made of copper, and the belt 63 and the lanyard 39 for securing the body are woven with conductive fibers. Furthermore, the worker's clothes are made of a fabric woven with conductive fibers.

  Therefore, the static electricity charged to the worker is the clothes, the belt 63 of the safety belt 27, the ring 59, the lanyard 39, the strap winder 33, the connection U-ring 57, the connection fitting 49, the fall prevention safety device 17, the horizontal rail. 9 can be leaked to the structure. At the same time, it is possible to prevent the occurrence of sparks due to the collision of metal fittings. Therefore, the fall prevention device 1 of this embodiment can prevent the fall of the worker in a so-called explosion-proof state.

  Moreover, as shown in FIGS. 16 and 17, the crash prevention device 1 is for preventing fall along the horizontal rail 9 fixed to a structure such as a roof steel material at the upper stop position of the tank lorry 3 of the relay gas station, for example. Since it is possible to travel and move by the conductive buffer members 43 of the two pairs of rollers 21 of the safety device 17, the safety device 17 for preventing the fall of the worker wearing the safety belt 27 connected to the safety device 17 while ensuring the electrical conductivity. It can easily follow the movement, does not place a burden on the worker, and can prevent the worker from falling.

  Noise is reduced compared to conventional brass rollers. Moreover, the fall prevention device 1 has electrostatic continuity. Furthermore, the impact absorbing performance is more than that of the conventional brass roller of 8 kN or less.

In the above-described embodiment, the example in which the connecting portion provided in the safety device main body 19 is the connecting hole portion 31 is shown. However, the connecting portion uses other configurations, for example, through holes provided in the safety device main body 19. It is set as a ring-shaped connecting member having conductivity, and a connecting metal fitting 49 is attached to the connecting member, or a conductive connecting rod attached to the safety device main body 19, and the connecting metal fitting 49 is attached to the connecting rod. May be. Further, an example in which the conductive buffer member 43 is extended from the outer peripheral surface of the roller main body 41 to the outer peripheral portions of both side surfaces of the roller main body 41 so that the roller main body 41 does not directly contact the horizontal rail 9 and covers both side surfaces of the roller main body 41. However, the conductive buffer member 43 is extended from the outer peripheral surface of the roller main body 41 to the outer peripheral portion of the roller main body 41 on the side of the safety device main body 19 and the side surface of the roller main body 41 is covered with the conductive buffer member 43. It may be a configuration.
That is, only the right side surface of the left roller body 41 shown in FIG. 12 may be covered with the conductive buffer member 43, and only the left side surface of the right roller body 41 shown in FIG. 12 may be covered with the conductive buffer member 43.
Alternatively, the conductive buffer member 43 extends from the outer peripheral surfaces of the roller main bodies 41 to the outer peripheral portion of the roller main body 41 on the side opposite to the safety device main body 19, and the side surfaces of the roller main body 41 are covered with the conductive buffer members 43. But you can.
That is, only the left side surface of the left roller body 41 shown in FIG. 12 may be covered with the conductive buffer member 43, and only the right side surface of the right roller body 41 shown in FIG. 12 may be covered with the conductive buffer member 43.
Alternatively, only the left side surface of the left roller body 41 shown in FIG. 12 may be covered with the conductive buffer member 43, and only the left side surface of the right roller body 41 shown in FIG. 12 may be covered with the conductive buffer member 43.
Thus, when the side surface of the roller body 41 is covered with the conductive buffer member 43, the conductive buffer member 43 contacts the horizontal rail 9, and the side surface of the roller body 41 not covered with the conductive buffer member 43 is the horizontal rail 9. The distance (distance) between the conductive buffer member 43 and the horizontal rail 9 and the distance (distance) between the side surface of the roller body 41 not covered with the conductive buffer member 43 and the horizontal rail 9 What is necessary is just to decide suitably.
That is, it is only necessary that the same effect as that of the embodiment shown in FIG. 12 can be obtained by covering the side surface of the roller body 41 in contact with the horizontal rail 9 with the conductive buffer member 43.

1 Fall prevention device 3 Cargo with flammable material (tank lorry)
DESCRIPTION OF SYMBOLS 5 Opening part 7 Guide groove 9 Horizontal rail 11 Rail holding bracket 17 Fall prevention safety device 19 Safety device main body 21 Roller 23 Support shaft 25 Bearing 27 Safety belt 29 Fall prevention member 31 Connection hole (connection portion)
33 Strap winder 35 Strap 37 Locking hook (locking tool)
39 Lanyard 41 Roller body 43 Conductive cushioning member 45 Dovetail groove (uneven portion)
47 Concave and convex shape (concave and convex part)
49 Connecting Bracket 53 Centrifugal Claw 55 Cover 57 Connecting U Ring 59 Ring 61 Buckle 63 Belt

Claims (2)

For prevention of fall including a safety belt, which can be freely moved in the guide groove of the cylindrical horizontal rail arranged and fixed on the structure and provided with a guide groove along the opening provided in the length direction of the lower surface. In the safety device for fall prevention that can connect the members,
A safety device main body that moves through the opening, a plurality of rollers rotatably provided on an upper portion of the safety device main body to run in the guide groove, and the fall prevention member that can be connected to the safety device main body With a connecting part provided at the bottom of
Each of the rollers is composed of an annular roller body, and a buffer member made of elastic rubber or resin provided on the outer periphery of the roller body .
The buffer member extends so as to cover the outer peripheral portions of both side surfaces of the roller body,
The safety device main body, the roller main body, the connecting portion and the buffer member have conductivity,
An uneven portion is provided on the outer peripheral surface of the roller body,
The buffer member covers the uneven portion and fits into the uneven portion, and has a thickness outside the outer peripheral surface of the uneven portion,
The buffer member is a rubber having elasticity, and is configured to be separable from the roller body by heating to 30 ° C. or higher .
A safety device for fall prevention characterized by that. The safety device for fall prevention according to claim 1,
The buffer member is formed integrally with the roller body;
A safety device for fall prevention characterized by that.

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