JP2010046325A - Safety belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety belt wherein an engagement position of a hook is detectable. <P>SOLUTION: The safety belt includes a waist belt worn around a worker, a connection strap which has one end and the other end and whose one end is joined to the waist belt, and a hook 2 joined to the other end of the connection strap. The hook 2 has: a hook-shaped hook body 10; a coming-off preventing device 20 which is turnably fitted to the hook body 10 and opens/closes an opening part 14 of the hook body 10; and a safety device 25 for regulating turning of the coming-off stop device 20. The hook 2 is fitted with: an open/close switch 60 for detecting opening/closing of the coming-off preventing device 20; a use situation detection sensor 50 for detecting a state where the hook 2 is hung over a hooked object; and an acceleration sensor 70 for detecting an attitude of the hook 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a safety belt for preventing a worker who performs work at a high place from falling, and more particularly, to a technique for grasping the usage status of the safety belt.

  In high-altitude work such as electric cable work, workers use safety belts to prevent falling. The safety belt includes a torso belt (human body belt) that is worn around the waist of an operator, a connecting body (lifeline) having one end fixed to the torso belt, and a hook fixed to the other end of the connecting body. The connecting body connects the body belt and the hook. An operator winds a torso belt around his / her body and hooks a hook at a predetermined location (an object to be hung) such as a master rope or a lap. Even when an operator accidentally drops his / her foot and falls, or the balance of the body is lost, the operator is suspended by the safety belt, and the fall is prevented.

There are cases where the safety belt was not used or the safety belt was used improperly in a crash incident that resulted in death or serious injury. In such cases, death and serious injury may have been avoided if the safety belts were used correctly. In other words, it is important to ensure that the operator uses the safety belt correctly in order to prevent a crash accident in work at a high place. Conventionally, there has been proposed a technique for reliably preventing a hook from being forgotten by confirming a hooking state of a safety belt (see, for example, Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 11-267237 JP 2007-44166 A

  By the way, it is determined that the hooking position of the hook at the tip of the safety belt must be higher than the waist of the operator. This is because if the operator crashes with the hook hooked lower than the waist, the fall distance at the time of the crash will be longer, and the impact load acting on the worker will be greater when the fall is stopped by the safety belt. This is because the possibility of visceral rupture and visceral failure and the possibility that an operator may collide with the structure below are considered.

  FIG. 15 is a schematic diagram showing a state in which the hook of the safety belt is hung at the correct height. FIG. 16 is a schematic diagram showing a state where the hook of the safety belt is hung at an incorrect height. 15 and FIG. 16, in FIG. 15, the worker hooks a horizontal bar provided at a position higher than the waist. On the other hand, in FIG. 16, the worker is hooking a horizontal bar located at a position lower than the waist, and the safety belt is not being used correctly.

  The techniques described in Patent Documents 1 and 2 can surely confirm that the hook is hooked, and if the hook is not hooked, it can be determined that the safety belt is not used. Cannot be detected. In order to determine whether the safety belt is used correctly, it is necessary to determine whether or not the hook is hooked at a position higher than the operator's waist. Conventionally, the hook hook position is detected. No technology has been proposed for this.

  The present invention has been made in view of the above problems, and its main object is to provide a safety belt capable of detecting the hook engagement position.

  A safety belt according to the present invention includes a belt that is mounted around an operator, one end and the other end, a connection body having one end coupled to the belt, and a hook coupled to the other end of the connection body. Is provided. The hook includes a hook-shaped hook body, a detachment prevention device that is rotatably attached to the hook body, and that opens and closes the opening of the hook body, and a safety device that restricts the rotation of the detachment prevention device. The hook is attached with a first sensor that detects opening and closing of the locking device, a second sensor that detects a state in which the hook is hung on the object to be hooked, and a third sensor that detects the posture of the hook. ing.

  Preferably, a switch is attached to the hook body so as to be moved by being pressed by the hooked object when the hook is hooked on the hooked object. The second sensor detects a state in which the hook is hung on the object to be hooked by detecting the movement of the switch.

  Preferably, the third sensor is an acceleration sensor. The posture of the hook is detected by outputting a change in the inclination of the acceleration sensor with respect to the vertical direction.

  Preferably, the posture of the hook is detected based on the output of the acceleration sensor in the time zone in which the hook is hooked on the object to be hooked.

  Preferably, the hook body has a base portion in which a connection hole to which the connection body is coupled is formed. The acceleration sensor is attached to the base of the hook body.

  The safety belt usage status confirmation method according to the present invention includes a step of hooking the hook of the safety belt according to any one of the above aspects on an object to be hooked. Further, it detects the posture of the hook during the time zone when the hook is hung on the object to be hung, and the hook is hung on the hung object positioned above the waist of the operator based on the detected position of the hook. A step of determining whether or not

  According to the safety belt of the present invention, since the position of the object to be hooked can be determined by detecting the posture of the hook, the hook is hooked at a position higher than the operator's waist. It can be determined that the safety belt is being used.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  In the embodiments described below, each component is not necessarily essential for the present invention unless otherwise specified. In the following embodiments, when referring to the number, amount, etc., unless otherwise specified, the above number is an example, and the scope of the present invention is not necessarily limited to the number, amount, etc.

  FIG. 1 is a schematic diagram showing a schematic configuration of a safety belt according to an embodiment of the present invention. As shown in FIG. 1, the safety belt 1 includes a torso belt 103 as a human body belt, a hook 2, and a connecting belt 107. The connecting belt 107 has one end 107a and the other end 107b. One end 107 a of the coupling belt 107 is coupled to the body belt 103, and the other end 107 b is coupled to the hook 2. In other words, the body belt 103 and the hook 2 are connected with the connecting belt 107 interposed therebetween. The connecting belt 107 has a function as a connecting body that connects the body belt 103 and the hook 2.

  The body belt 103 includes a main body 109 and a buckle 111 located at an end of the main body 109. The body belt 103 also includes a D ring 113 and a D ring stopper 115. The torso belt 103 is wound around the torso of the worker wearing the safety belt 1 and attached to the operator. Instead of the torso belt 103 or together with the torso belt 103, a human body belt wound around the shoulder, thigh, chest, etc. of the operator may be prepared, and this may be coupled to the connecting belt 107.

  A first stitching portion 117 is provided on the one end 107 a side of the connection belt 107. The first stitching portion 117 is formed by the connecting belt 107 being passed through the D-ring 113, folded, overlapped, and stitched. The body belt 103 and the connecting belt 107 are coupled by the D ring 113 and the first stitching portion 117. The surface of the first stitching portion 117 is covered with a heat shrinkable tube 119. A hook (not shown) having the same mechanism as the hook 2 in FIG. 1 may be provided at one end 107a of the connecting belt 107, and the body belt 103 and the connecting belt 107 may be coupled by this hook.

  A second stitching portion 121 is provided on the other end 107 b side of the connecting belt 107. The second stitching portion 121 is formed by passing the coupling belt 107 through the coupling hole 19 formed in the hook 2 and folding it back, and overlapping and stitching. The hook 2 and the connecting belt 107 are joined by the second stitching portion 121. The surface of the second suture part 121 is also covered with the heat shrinkable tube 119.

  FIG. 2 is a schematic diagram showing the configuration of the hook. FIG. 3 is a lower side view of the hook. Details of the hook 2 will be described with reference to FIGS. 2 and 3. FIG. 3 shows a case where the hook 2 shown in FIG. 2 is viewed from the lower side to the upper side.

  As shown in FIGS. 2 and 3, the hook 2 includes a hook body 10, a locking device 20, and a safety device 25. The hook body 10 is formed to be bent in a bowl shape. The hook main body 10 has a base portion 17 to which the connecting belt 107 is coupled, a back portion 15 extending linearly from the base portion 17, a curved portion 11 curved in an arc shape, and a tip portion 13 at the tip, and is substantially U-shaped. It is formed in the shape of a heel bent. A connecting hole 19 through which the connecting belt 107 is inserted is formed in the base portion 17, and an annular ring 18 is formed around the connecting hole 19. The U-shaped hook body 10 forms an opening portion 14 between the tip portion 13 and the back portion 15. From the back part 15 to the base part 17, a groove part 12 in which the surface of the hook body 10 is recessed is formed. Inside the groove portion 12, a wiring connected to a use state detection sensor 50 described later is disposed.

  The anti-separation device 20 is formed so as to span the opening 14. The anti-slip device 20 is rotatably attached to the hook body 10 with a bolt 99 as a fastening member with a small plate 21 interposed. The anti-separation device 20 is formed in a U-shaped cross-sectional shape, and the hook body 10 and the safety device 25 are disposed in the U-shaped recess. Further, the end portion of the locking device 20 is engaged with the tip portion 13 of the hook body 10. The tip portion 13 defines a movable range of the stopper device 20.

  The stopper 20 is biased in a direction from the opening 14 toward the tip 13 by a biasing means (not shown). The anti-skid device 20 is biased in a direction in which the anti-skid device 20 is pressed against the tip 13 of the hook body 10. The anti-separation device 20 is urged in the clockwise direction shown in FIG. 2 with the bolt 99 as an axis, and its movable range is restricted by contacting the tip portion 13. That is, the movable range of the stopper device 20 is limited to the inside of the opening 14.

  The anti-separation device 20 opens and closes the opening 14 by swinging the inside of the opening 14. The anti-separation device 20 opens and closes the opening 14 that is an opening formed in the U-shaped hook body 10 from the inside. The stopper device 20 is supported at the tip of the opening portion 14, and the U-shaped opening portion 14 can be opened and closed by the swinging of the stopper device 20.

  The safety device 25 is rotatably attached to the hook body 10 by a bolt 96. The safety device 25 is formed in a U-shaped cross-sectional shape, and the hook body 10 is disposed in the U-shaped recess. The safety device 25 is urged in a clockwise direction shown in FIG. 2 by an urging means (not shown) with the bolt 96 as an axis. The safety device 25 is biased in a direction away from the hook body 10. Both the locking device 20 and the safety device 25 are biased in a direction away from the back portion 15 of the hook body 10. Therefore, the locking device 20 is disposed so as to straddle the U-shaped opening 14 of the hook body 10 and is engaged with the tip 13 of the hook body 10.

  FIG. 4 is a component diagram of the safety device. As shown in FIG. 4, the safety device 25 is formed with a round hole 26 and a long hole 27. The safety device 25 is attached to the hook body 10 by inserting the bolt 96 into the round hole 26. The locking device 20 is assembled to the safety device 25 by a bolt 97 inserted through the long hole 27. When the bolt 97 slides in the long hole 27, the anti-separation device 20 rotates around the bolt 99 in conjunction with the safety device 25.

  FIG. 2 shows the arrangement of the safety device 25 when an external force other than the urging force by the urging means is not acting on the safety device 25. In the state where the safety device 25 is in the position shown in FIG. 2, the bolt 97 is inside the hollow portion 27 a shown in FIG. 4, and the free sliding movement of the bolt 97 in the long hole 27 is restricted. Therefore, the locking device 20 cannot freely rotate from the state shown in FIG. FIG. 2 illustrates a state in which the rotation of the locking device 20 is restricted by the safety device 25.

  A non-use switch 30 is also attached to the hook body 10. FIG. 5 is a component diagram of the unused switch. As shown in FIG. 5, the unused switch 30 is formed with round holes 32, 33, long holes 34, 35, 36, and a spring hole 37. The unused switch 30 includes a curved portion 31 that is curved in an arc. The unused switch 30 can be formed such that the inner peripheral edge 31a of the bending portion 31 includes substantially the same shape as the inner peripheral edge 11a (see FIG. 2) of the bending portion 11 of the hook body 10. For example, the inner peripheral edge 11a and the inner peripheral edge 31a can be formed in a shape including an arc shape having the same curvature.

  A connecting member 40 is further attached to the hook body 10. FIG. 6 is a component diagram of the connecting member. As shown in FIG. 6, the connecting member 40 is formed with round holes 42, 44, 45, 46 and a spring hole 47. The connecting member 40 is formed with a through hole 48 having a large diameter with respect to the round hole. The connecting member 40 is arranged so that the through hole 48 is formed near the end of the groove 12. The wiring connected to the use state detection sensor 50 passes through the through hole 48.

  The unused switch 30 and the connecting member 40 are coupled by bolts 82, 84, 85, 86 shown in FIG. The bolt 82 passes through the round hole 32 formed in the unused switch 30 and the round hole 42 formed in the connecting member 40. The non-use switch 30 is attached to the hook body 10 so as to be rotatable relative to the hook body 10 about the bolt 82 as an axis. The bolt 86 passes through the round hole 46 of the connecting member 40. The connecting member 40 is fixed to the hook body 10 by the bolts 82 and 86, and the connecting member 40 does not move with respect to the hook body 10, but the unused switch 30 rotates relative to the connecting member 40. .

  The bolt 84 is fastened to the connecting member 40 at the round hole 44, and is inserted into the long hole 34 of the unused switch 30. The bolt 84 is fastened to the connecting member 40 at the round hole 45, and is inserted into the long hole 35 of the unused switch 30. The bolt 86 passes through the long hole 36 of the unused switch 30 and further passes through the hook body 10, and is fastened to the connecting member 40 at the round hole 46.

  The unused switch 30 rotates relative to the connecting member 40 about the bolt 82 as an axis. The long holes 34, 35, 36 formed in the unused switch 30 guide the unused switch 30 when the unused switch 30 rotates around the bolt 82, and the It has a function to define the movable range.

  Both ends of a spring 87 as an elastic member are engaged with the spring hole 37 formed in the unused switch 30 and the spring hole 47 formed in the connecting member 40. One end of the spring 87 is engaged with the spring hole 37, and the other end of the spring 87 is engaged with the spring hole 47. The unused switch 30 is urged by the elastic force of the spring 87 in the direction in which the spring hole 37 and the spring hole 47 are close to each other. The spring 87 urges the unused switch 30 in the clockwise direction around the bolt 82 shown in FIG. That is, the inner peripheral edge 31 a of the bending portion 31 of the non-use switch 30 moves toward the opening 14 with respect to the inner peripheral edge 11 a of the bending portion 11 of the hook body 10 and is used in a direction closer to the anti-separation device 20. The unused switch 30 is energized.

  On the base 17 of the hook body 10, an opening / closing switch 60 is arranged as a first sensor that detects opening / closing of the locking device 20. A pressing bar 62 is fixed to the locking device 20, and the pressing bar 62 rotates around the bolt 99 together with the locking device 20.

  In the state shown in FIG. 2, the pressing bar 62 is close to the opening / closing switch 60, and the pressing bar 62 presses the contact lever 61 of the opening / closing switch 60. At this time, the open / close switch 60 detects that the contact lever 61 is in contact, thereby outputting that the anti-separation device 20 is in contact with the tip portion 13 of the hook body 10. A known limit switch can be used as the open / close switch 60.

  In the gap between the unused switch 30 and the connecting member 40, a usage state detection sensor 50 as a second sensor for detecting a state in which the hook 2 is hooked on an object to be hooked is disposed. As shown in FIG. 2, a bolt 83 that is fastened through a round hole 33 (see FIG. 5) is fixed to the unused switch 30. The bolt 83 rotates around the bolt 82 together with the unused switch 30.

  In the state shown in FIG. 2, the bolt 83 is close to the use state detection sensor 50, and the bolt 83 presses the contact lever 51 of the use state detection sensor 50. At this time, the use state detection sensor 50 outputs that the hook 2 is not hung on the object to be hung and is in a non-use state by detecting that the contact lever 51 is in contact. In the non-use state, the use non-use switch 30 is arranged so that the inner peripheral edge 31 a of the non-use switch 30 is on the opening 14 side with respect to the inner peripheral edge 11 a of the hook body 10. A known limit switch can be used.

  A substrate 71 is attached to the base 17 of the hook body. On the substrate 71, an acceleration sensor 70 as a third sensor for detecting the attitude of the hook 2 is placed. A substrate 76 is also attached to the base 17, and an inclination sensor 75 is placed on the substrate 76.

  The opening / closing switch 60 and the acceleration sensor 70 are attached to the base 17 of the hook body 10. The unused switch 30 is disposed from the curved portion 11 to the back portion 15 of the hook body 10, and the used state detection sensor 50 is attached near the end of the unused switch 30 on the back portion 15 side. By arranging the sensors and switches in this way, it is possible to prevent the sensors and switches from interfering with the operation of the operator trying to hook the hook 2. That is, in the hook 2 of the safety belt 1 of the present embodiment, operability equivalent to that of the conventional safety belt hook is ensured.

  The operation | movement of each part of the hook 2 when the hook 2 of the safety belt | band | zone 1 provided with the above structure is hung on a to-be-latched object is demonstrated. FIG. 7 is a schematic diagram showing a hook before being hung on an object to be hung. FIG. 8 is a schematic view showing the hook in the open state in which the anti-separation device is rotationally moved. FIG. 9 is a schematic diagram showing the hook in a non-use state before the hooked object is engaged with the hook body. FIG. 10 is a schematic view showing a hook in a used state in which a hooked object is engaged with the hook body.

  When the hook 2 is hung on an object to be fixed such as a master rope or a trap, the operator first holds the hook 2 and rotates the safety device 25 around the bolt 96 to attach the hook body 10 to the hook body 10. The safety device 25 is brought close. By the movement of the safety device 25, the bolt 97 is removed from the recess 27a (see FIG. 4) of the long hole 27, and the anti-separation device 20 is not regulated by the safety device 25 and is in a freely unlocked state.

  Subsequently, the locking device 20 is moved to the inside of the opening 14. When the bolt 97 slides in the long hole 27, the locking device 20 rotates around the bolt 99, and a gap 24 is generated between the tip 13 of the hook body 10 and the locking device 20. The object to be hooked is made to enter the inside of the hook-shaped hook body 10 through the gap 24. The movement of the detachment prevention device 20 may be performed by an operator holding the hook 2, and the object to be engaged is pressed against the detachment prevention device 20 from the outside (right side in FIG. 8). May be performed.

  As described above, the pressure bar 62 is attached to the stopper device 20. With the rotation of the locking device 20, the pressing bar 62 moves to the side away from the open / close switch 60. At this time, the pressing force acting on the contact lever 61 from the pressing bar 62 is released, and the contact lever 61 moves away from the open / close switch 60. Upon detecting the movement of the contact lever 61, the open / close switch 60 outputs that the hook 2 is in an open state. In the hook 2 in the open state, the locking device 20 is separated from the tip portion 13 of the hook body 10, and a gap 24 is formed between the tip portion 13 and the locking device 20. That is, the open / close switch 60 detects that the hook 2 is in an open state by detecting the rotational movement of the stopper device 20.

  After the hooked object is completely accommodated in the U-shape of the hook body 10, when the operator stops gripping the hook 2, the locking device 20 rotates backward around the bolt 99 and returns to its original position. The gap 24 generated between the tip portion 13 and the locking device 20 is closed again. When the load applied to the safety device 25 by the operator is released, the bolt 97 moves to the recess 27a of the long hole 27, and the safety device 25 restricts the rotation of the stopper device 20. That is, since the safety device 25 acts so that the stopper device 20 does not move and cause the gap 24, it is possible to prevent the object to be caught from jumping out from the inside of the U-shape of the hook body 10, The hook 2 is not opened and closed unintended by the operator.

  Subsequently, as shown in FIGS. 9 and 10, the object H to be engaged is engaged with the bending portion 11 of the hook body 10. At this time, the hooked object H contacts the inner peripheral edge 31a of the unused switch 30 and presses the unused switch 30 to rotate the unused switch 30 around the bolt 82. When the hook 2 is hooked on the hooked object H, the unused switch 30 comes into contact with the hooked object H and is pressed and rotated by the hooked object H. The hook body 10 moves so as to overlap the curved portion 11.

  As described above, the bolt 83 is fixed to the unused switch 30, and the bolt 83 moves to the side away from the used state detection sensor 50 as the unused switch 30 rotates. At this time, the pressing force acting on the contact lever 51 from the bolt 83 is released, and the contact lever 51 moves away from the use state detection sensor 50. When the movement of the contact lever 51 is detected, the use state detection sensor 50 outputs that the hook 2 is in a use state in which the hook 2 is hung on the to-be-latched object H. That is, the use state detection sensor 50 detects that the hook 2 is in a use state in which the hook 2 is hung on the to-be-hung object H by detecting the rotational movement of the non-use switch 30.

  Next, detection of the posture of the hook 2 by the acceleration sensor 70 will be described. The operator hangs the hook 2 when trying to hang the hook 2 on the hanging object positioned lower than the operator's waist and when trying to hang the hook 2 on the hanging object positioned higher than the waist. The posture of the hook 2 during operation and the direction of the force applied to the hook 2 when the hook 2 is hooked are different. Therefore, by attaching the acceleration sensor 70 to the hook 2 and estimating the posture of the hook 2 using the output of the acceleration sensor 70, the object to be hung on which the hook 2 is hung based on the estimated posture of the hook 2 is obtained. The height can be judged.

  Here, the attitude of the hook 2 refers to an inclination angle of the hook 2 with which the hook 2 is inclined relative to a predetermined reference axis (for example, a horizontal axis or a vertical axis).

  FIG. 11 is a schematic diagram for illustrating a relationship between the posture of the hook and the output of the acceleration sensor. Here, it is assumed that an object to be hooked by the hook 2 is a horizontal bar. When the hook 2 is directly hung on a horizontal bar without turning it, in order to determine that the hook 2 is hung higher than the operator's waist, the posture of the hook 2 around one axis along the horizontal direction is determined. Detection is considered important. Therefore, by extracting the value of the one axis (referred to as the X axis) of the acceleration sensor 70, whether the hook 2 is hooked can be detected.

  In FIG. 11A, the hook 2 is disposed so that the curved portion 11 and the base portion 17 of the hook body 10 are substantially horizontal, the anti-separation device 20 is on the lower side, and the safety device 25 is on the upper side. The acceleration sensor 70 is placed on the upper surface of the substrate 71 with respect to the substrate 71 arranged horizontally. The output in the X-axis direction of the acceleration sensor 70 at this time is X = 512.

  In FIG. 11B, the hook 2 is arranged so that the bending portion 11 and the base portion 17 of the hook body 10 are substantially vertical, the bending portion 11 is on the lower side, and the base portion 17 is on the upper side. An acceleration sensor 70 is placed on a substrate 71 arranged to be a vertical plane. The X-axis direction output of the acceleration sensor 70 at this time is X = 256.

  In FIG. 11C, the hook 2 is disposed so that the curved portion 11 and the base portion 17 of the hook body 10 are substantially vertical, the base portion 17 is on the lower side, and the curved portion 11 is on the upper side. An acceleration sensor 70 is placed on a substrate 71 arranged to be a vertical plane. The output in the X-axis direction of the acceleration sensor 70 at this time is assumed to be X = 768.

  In FIG. 11 (d), the hook 2 is arranged so that the curved portion 11 and the base portion 17 of the hook body 10 are substantially horizontal, the locking device 20 is on the upper side, and the safety device 25 is on the lower side. The acceleration sensor 70 is placed on the lower surface of the substrate 71 with respect to the substrate 71 arranged horizontally. The output in the X-axis direction of the acceleration sensor 70 at this time is X = 512.

  11A to 11D, the inclination of the hook 2 with respect to the reference X axis is changed. As the inclination of the hook 2 with respect to the X axis changes, the inclination of the acceleration sensor 70 with respect to the vertical direction also changes. When only the gravitational acceleration is detected using the X-axis value of the acceleration sensor 70, the change in the inclination of the acceleration sensor 70 with respect to the vertical direction when the inclination of the acceleration sensor 70 changes is output, so that the hook 2 The posture can be detected. That is, using the acceleration sensor 70, it is possible to detect the attitude of the hook 2 when the hook 2 is hung on an object to be hooked.

  The safety belt 1 provided with the hook 2 having the acceleration sensor 70 is actually attached to the worker, and the worker hangs the hook 2 on the horizontally suspended pipe that is the object to be hung. The results of collecting the output values of the acceleration sensor 70 are shown in FIGS. FIG. 12 is a graph showing an example of the output of the acceleration sensor when the hook is put on an incorrect height. FIG. 13 is a graph showing an example of the output of the acceleration sensor when the hook is hung at the correct height.

  The vertical axis | shaft of FIG. 12 and FIG. 13 shows the output value of the acceleration sensor 70 demonstrated based on FIG. The horizontal axis of FIG. 12 and FIG. 13 shows the elapsed time and is based on the time when the hook 2 is opened. That is, the time when the value of the horizontal axis in FIG. 12 and FIG. 13 becomes 0 is the time when the opening / closing switch 60 detects that the hook 2 has been opened. In FIG. 12 and FIG. 13, the left line drawn parallel to the vertical axis indicates the approximate time when the hook 2 is opened, and the right line is in use since the hook 2 is hung on the pipe. Indicates the approximate time.

  The height of the pipe on which the hook 2 is hung was set in seven stages based on the height of the operator's waist. Specifically, three levels of height (waist height−250, 500, 750) mm were set as erroneous heights. As the correct height, four levels of height (waist height + 0, 250, 500, 750) mm were set.

  As shown in FIG. 12, when the hook 2 is hung at a position lower than the waist, the output of the acceleration sensor 70 in the time zone in which the hook 2 is hung on the pipe is relatively low. On the other hand, as shown in FIG. 13, when the hook 2 is hung at a position higher than the waist, the output of the acceleration sensor 70 in the time zone in which the hook 2 is hung on the pipe is relatively high. That is, comparing FIG. 12 and FIG. 13, there is a clear difference in the output of the acceleration sensor 70 due to the difference in the height at which the hook 2 is hung. That is, the position of the object to be hooked on the hook 2 can be determined based on the posture of the hook 2 detected by the acceleration sensor 70, and the object to be hooked positioned above the waist of the operator can be determined. It can be seen that it is possible to determine that the safety belt 1 is being used in the correct state where the hook 2 is hooked.

  As described above, in the safety belt 1 of the present embodiment, the hook 2 has a state in which the opening / closing switch 60 that detects the opening / closing of the anti-separation device 20 and the hook 2 is hung on the to-be-latched object H. A usage status detection sensor 50 to detect and an acceleration sensor 70 to detect the posture of the hook 2 are attached.

  In this way, it is possible to detect the time when the hook 2 is in the open state using the open / close switch 60, and to detect the time when the hook 2 is in the use state using the use state detection sensor 60. The acceleration sensor 70 can be used to detect the posture of the hook 2 between these two times, that is, the time zone in which the hook 2 is hung on the to-be-latched object H. By detecting the posture of the hook 2, the position of the object H to which the hook 2 is hooked can be determined, so that the safety belt 1 can be properly placed with the hook 2 hooked at a position higher than the operator's waist. Can be determined.

  Next, the usage status monitoring method for the safety belt described above will be described. FIG. 14 is a flowchart showing a method for monitoring the usage status of the safety belt. When the worker wearing the safety belt 1 tries to hang the hook 2 on the object to be hooked, the worker first holds the hook 2 in step (S10) as shown in FIG.

  Subsequently, in the step (S20), in the hook 2 gripped by the worker, the safety device 25 is released and the anti-slip device 20 rotates around the bolt 99, so that the anti-skid device 20 is opened. Subsequently, in step (S30), the object to be hooked is moved into the U-shaped hook body 10 through the gap 24 between the tip 13 of the hook body 10 and the locking device 20. Subsequently, in step (S40), the object to be hooked presses the unused switch 30 and moves the unused switch 30 so as to overlap the curved part 11 of the hook body 10, and the bent object is moved to the curved part. 11 is brought into contact with the inner peripheral edge 11a so that the hook 2 is put on the object to be hung. Subsequently, in the step (S50), the anti-slip device 20 is reversely rotated around the bolt 99, and the anti-skid device 20 is closed. Steps (S20) to (S50) are included in the “step of hooking hook 2 of safety belt 1 on the object to be hooked”.

  Subsequently, in the step (S60), the posture of the hook 2 is detected by using the acceleration sensor 70 in the time zone in which the hook 2 is hung on the object to be caught (that is, between steps (S20) to (S50)). To do. Subsequently, in the step (S70), based on the detected posture of the hook 2, it is determined that the hook 2 is hung on an object to be positioned above the waist of the operator. If it is determined that the height of the object to be hooked is higher than the waist of the worker, the use of the safety belt is good (S80).

  On the other hand, if it is determined that the height of the object to be hooked is lower than the waist of the worker, the use state of the safety belt is determined to be poor (S90). In step (S100), a warning is transmitted to inform the operator that the safety belt is not being used. At the same time, it is also possible to inform surrounding workers and supervisors that the use situation of the safety belt worn by the workers is poor.

  Although the embodiment of the present invention has been described as above, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram which shows schematic structure of the safety belt which concerns on one embodiment of this invention. It is a top view which shows the structure of a hook. It is a lower side view of a hook. It is component drawing of a safety device. It is a component diagram of an unused switch. It is a component drawing of a connection member. It is a schematic diagram which shows the hook before being hung on a to-be-latched object. It is a schematic diagram which shows the hook of the open state which the anti-separation device rotated. It is a schematic diagram which shows the hook of a non-use state before a to-be-latched object engages with a hook main body. It is a schematic diagram which shows the hook of the use state which the to-be-latched object engaged with the hook main body. It is a schematic diagram for showing the relationship between the attitude | position of a hook and the output of an acceleration sensor. It is a graph which shows an example of the output of the acceleration sensor at the time of hooking on a wrong height. It is a graph which shows an example of the output of the acceleration sensor at the time of hooking on a correct height. It is a flowchart which shows the monitoring method of the usage condition of a safety belt. It is a schematic diagram which shows the state which hooked the hook of the safety belt on the correct height. It is a schematic diagram which shows the state which hooked the hook of the safety belt on the wrong height.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Safety belt, 2 hooks, 10 hook main body, 11 bending part, 11a inner periphery, 13 front-end | tip part, 14 opening part, 17 base, 20 locking device, 24 clearance, 25 safety device, 30 unused switch, 31 bending Part, 31a inner peripheral edge, 40 connecting member, 50 use state detection sensor, 51 contact lever, 60 open / close switch, 61 contact lever, 62 pressing bar, 70 acceleration sensor, 71 substrate, 83 bolt, 87 spring.

Claims (6)

A belt to be worn around the operator;
A connection body having one end and the other end, the one end being coupled to the belt;
A hook coupled to the other end of the connector,
The hook includes a hook-shaped hook body, a locking device that is rotatably attached to the hook body and opens and closes an opening of the hook body, and a safety device that restricts the rotation of the locking device. ,
The hook includes a first sensor that detects opening and closing of the locking device, a second sensor that detects a state in which the hook is hung on an object to be hooked, and a third sensor that detects a posture of the hook. And safety belt attached. The hook body is attached with a switch that moves by being pressed by the hooked object when the hook is hooked on the hooked object.
2. The safety belt according to claim 1, wherein the second sensor detects a state in which the hook is hooked on the object to be hooked by detecting movement of the switch. The third sensor is an acceleration sensor,
The safety belt according to claim 1 or 2, wherein a posture of the hook is detected by outputting a change in inclination of the acceleration sensor with respect to a vertical direction.   The safety belt according to claim 3, wherein an attitude of the hook is detected based on an output of the acceleration sensor in a time zone in which the hook is hooked on the object to be hooked. The hook body has a base portion in which a connection hole to which the connection body is coupled is formed,
The safety belt according to claim 3 or 4, wherein the acceleration sensor is attached to the base portion of the hook body. Hang the hook of the safety belt according to any one of claims 1 to 5 on an object to be hooked;
Detecting the hook posture during the time zone when the hook is hooked on the hooked object, and based on the detected hook attitude, the hooked object positioned above the waist of the worker is A method for monitoring the use of a safety belt, comprising the step of discriminating that a hook has been hung.

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