JP5797495B2 - Lifeline hook for fall prevention - Google Patents

Description

  The present invention relates to a fall prevention lifeline hook for mooring a lifeline to a masterline supported by a plurality of support parts in high-altitude work.

  In high-altitude work, it is common to work by connecting a lifeline to a master rope (rope, wire, trolley wire, etc.) that is provided with a scaffold and stretched laterally. Such a master rope is generally supported in a T shape by an intermediate support at predetermined intervals. For this reason, when the lifeline is moored to the master rope using a hook or the like and the worker can move in the lateral direction by sliding the hook along the master rope, the hook is provided at a predetermined interval. Intermediate support becomes an obstacle. When the hook reaches the position where the intermediate support is provided by sliding, the intermediate support cannot be passed as it is, and the hook must be detached from the master rope once.

  Thus, every time it passes through the intermediate support, the lifeline must be separated from the parent rope, which makes the worker dangerous. Therefore, the sub hook is used together with the main hook moored at the time of work, and when the main hook reaches the intermediate support, before the main hook is detached from the master rope, the sub hook is moored with the operator. In many cases, a so-called “two-catch” safety measure is taken, in which the main hook is replaced while the mooring state with the master rope is maintained.

  As described above, the master rope is supported by the intermediate support at every predetermined interval, but it is necessary to install it at an interval that can ensure sufficient safety so that it does not touch the ground when the operator falls. is there. This interval differs depending on the material of the master rope, but when it is supported at a short interval, it is troublesome to change the hook, and the work efficiency is lowered. For this reason, there is a possibility that the work is performed in a dangerous state in which the main hook is replaced without using the sub hook.

  Therefore, conventionally, a coupling tool that can pass through the support portion of the intermediate support body while maintaining the moored state to the master rope without being bothered by changing the hook each time the intermediate support body is passed. Is considered.

  FIG. 7 is a view showing a conventional safety band locking device 101. (A) is the figure which looked at the mooring state of the safety band locking device 101 from the direction orthogonal to the master rope 110, and (b) is the figure seen from the direction where the master rope 110 is extended.

  The main body 102 of the safety strap hooking device 101 is configured in a bobbin shape by two discs 105 and a cylindrical shaft 104 that connects the two discs 105 to each other. In addition, a fastening portion 108 for fastening a lifeline is provided below the safety strap locking device 101, and the fastening portion 108 is disposed so as to cover the two disks 105 described above from the outside. The movable connecting portion 103 is integrated.

  The movable connecting portion 103 is pivotally supported so as to be rotatable relative to the main body portion 102. However, when the lower fastening portion 108 is pulled forward in the sliding direction, the movable connecting portion 103 and the main body portion 102 are integrally tilted forward and the fastening portion 108 is pulled backward. The rotation in one direction is restricted so that the relative rotation of the movable connecting portion 103 with respect to the main body portion 102 is allowed.

In addition, four hooks 106 are provided between two disks 105 constituting the main body 102. These hooks 106 are arranged so as to extend in a cross shape in the radial direction from the cylindrical shaft 104, and the respective tips are bent into an L shape so as to be parallel to the cylindrical shaft 104 to form a locking portion 107. It has been. Each of these locking portions 107 is arranged so as to be swingable about an axis connected to the cylinder shaft 104 and is urged so as to be orthogonal to the master rope 110. Further, each of the locking portions 107 is restricted from rotating in the direction in which the safety band locking device 101 opens rearward in the sliding direction in the positional relationship in the mooring state with the master rope 110.

  Here, when the sliding safety band locking device 101 reaches the support position by the intermediate support 111, the locking portion 107 moored to the master rope 110 is restricted from rotating backward. It cannot be opened and is brought into pressure contact with the intermediate support 111, and only the lower fastening portion 108 side is pulled forward in the sliding direction. As a result, as described above, the main body portion 102 is integrally tilted forward, and the hook 106 moored to the master rope 110, that is, the hook 106 that is in pressure contact with the intermediate support 111. An adjacent (front side) hook 106 approaches the master rope 110 from the lower side.

  At this time, the locking portion 107 of the hook 106 approaching the master rope 110 from the lower side is brought into contact with the master rope 110 from the lower side. As described above, the locking portion 107 in this case is Since rotation in the direction of opening to the opposite side to the rope 110 is allowed, the ball can be turned against the urging force, and can move from the lower side to the upper side to be moored to the parent rope 110. In this way, after the hook 106 is moored to the master rope 110 on the front side in the sliding direction with respect to the intermediate support 111, the locking portion of the hook 106 that is in contact with the rear side of the original intermediate support 111. Since 107 rotates so that it may open upwards, it can remove | deviate from the master rope 110 to the downward side.

  As described above, with the movement of the worker, the two adjacent hooks 106 are automatically moved across the intermediate support 111 simply by pulling the fastening portion 108 of the safety strap device 101 via the lifeline. Can be replaced. Therefore, the operator can smoothly pass through the intermediate support 111 without being bothered with changing the hook 106.

JP 2007-98046 A

  However, in the safety band locking device 101, when the intermediate support 111 is crossed, there are only two hooks 106 adjacent to each other among the four hooks 106 provided, and at least at the time of this replacement. The other two hooks 106 are redundant.

  In the configuration of the safety band locking device 101 described above, when the fastening portion 108 is tilted by being pulled by an operator at the position of the intermediate support 111, both of the locking portions 107 of the two hooks 106 involved in the replacement are provided on both sides. In both cases, the master rope 110 abuts in the opening direction opposite to the biased direction.

  That is, the locking portion 107 on the side moored to the master rope 110 from the beginning so that the lower side of the main body portion 102 is tilted forward in the sliding direction so that the swingable swinging direction is upward. Tilt together. For this reason, it will be in the state which opens to the upper side and tends to remove | deviate to the lower side of the master rope 110.

  On the other hand, when the lower side of the main body 102 is tilted forward in the sliding direction, the locking portion 107 that comes into contact with the master rope 110 from the lower side is easily opened to the lower side and moored to the upper side of the master rope 110. It becomes a state.

  Therefore, as an extreme example, when two adjacent hooks 106 to be interchanged are arranged at an interval of approximately 180 °, they are simultaneously locked by the force from the master rope 110 that is in a pressed state. The part 107 starts to rotate, and the replacement of the hook 106 does not work well.

  That is, it is necessary to arrange the hook 106 so that the swinging direction of the locking portion 107 is not parallel to the master rope 110. In other words, since it is necessary to arrange them at an angle smaller than 180 ° in the circumferential direction, it is necessary to provide at least 3 to 4 hooks 106 on the circumference.

  For this reason, the number of components increases, the cost increases, and the weight increases by the increased number of components, making it difficult to handle at high places.

  Therefore, in the present invention, in order to solve the above-described problem, it is possible to reduce the weight by suppressing the number of parts, and to maintain a state in which any hook is always moored to the master rope before and after the intermediate support. An object of the present invention is to provide a lifeline hook for fall prevention having a simple configuration.

In order to achieve the above-described object, the lifeline hook for fall prevention according to the present invention is fixed at a predetermined interval by an intermediate support and is slidably moored along a mainline stretched in a lateral direction. A lifeline hook for fall prevention that is connected, and includes a base portion and first and second linear bodies protruding above the base portion, and the first linear body has a bent tip portion. The base end portion extending upward from the base portion can swing about the axis, and the second linear body is urged so as to be in pressure contact with the distal end portion from the rear side in the sliding direction of the side surface of the second linear body. The first and second linear bodies and the base portion form a ring shape through which the parent rope can pass, and at least two hook portions arranged in the direction in which the parent rope is stretched , and under the base portion And a connecting portion to which a lifeline is connected.

  If comprised in this way, the lifeline connected with the operator will be pulled, and the intermediate support of the master rope will be carried out at the front-end | tip part of the 1st linear body of the hook part of the front side of a sliding direction among two sets of hook parts. When the body comes into contact, the first linear body swings against the urging force and moves away from the second linear body in the sliding direction, and the ring shape is opened. Then, after passing through the intermediate support, the first linear body and the second linear body that have been returned by the urging force are brought into the original pressure contact state, and the ring shape is formed again. Further, the hook portion on the rear side in the sliding direction similarly allows the intermediate support to pass through the swinging opening and closing of the first linear body.

  Thus, after the hook portion on the front side in the sliding direction passes through the intermediate support body with the opening and closing operation and the original ring shape is formed, the hook portion on the rear side in the next sliding direction performs the opening and closing operation. Since it starts, at least one hook part always holds a mooring state with respect to the master rope. Thereby, even when passing through the intermediate support, it is possible to prevent the lifeline from being detached from the master rope, ensuring the safety of the operator and enabling smooth movement.

  In addition to the above configuration, the fall prevention lifeline hook according to the present invention is such that the first linear body has a bent portion formed between the proximal end portion and the distal end portion, and the bent portion is bent. The inner diameter of the first linear body is smaller than the outer diameter of the master rope, and is formed at a position higher than the pressure contact portion of the first linear body with respect to the second linear body.

  If comprised in this way, the master rope in a mooring state will be biased to the bending part side currently formed in the position higher than a press-contact part in the ring shape which a hook part forms.

As described above, since the height difference is provided between the bent portion and the pressure contact portion, the position of the main rope in the hook portion is stabilized in the sliding state, so that the posture of the lifeline hook for fall prevention is stable. Smooth sliding is possible.

  Moreover, the lifeline hook for fall prevention of the present invention is characterized in that, in addition to the above configuration, the tip portion is inclined downward at an angle of 45 ° or less from the bent portion toward the press contact portion.

  If comprised in this way, when a 1st linear body and a 2nd linear body are in a press-contact state, the lower end side of a front-end | tip part will contact | abut at an angle of 45 degrees or less with respect to the upper end of a master rope.

  In this way, the lower end side of the tip portion contacts the parent rope at an angle of 45 ° or less, so that the tip portion contacts only a part of the upper end side of the parent rope even in the swinging state. Therefore, friction with the first linear body with respect to the master rope during swinging is reduced, and smooth swinging is possible.

  Moreover, the lifeline hook for fall prevention of the present invention is characterized in that a tip portion is curved so as to protrude downward between the bent portion and the pressure contact portion.

  If comprised in this way, the lower end side of a front-end | tip part will be a point contact with respect to the upper end of a master rope.

  Thereby, the friction between the master rope and the tip of the first linear body during the swinging is further reduced.

  As described above, according to the present invention, when passing through the intermediate support, it is dropped only from the minimum two hook portions of the hook portion where the mooring to the master rope is released and the hook portion where the mooring is maintained. Since the lifeline hook for prevention is configured, it is possible to reduce the cost of parts by an amount not including unnecessary hook portions. In addition, since the weight can be reduced by simply configuring with a small number of parts, it is easy to handle and work safety can be improved in high place work that lacks stability.

It is the perspective view which showed the mooring state of the lifeline hook for fall prevention which concerns on the 1st Embodiment of this invention. It is a perspective view by the side of the bottom face of the mooring state of the lifeline hook for fall prevention of FIG. It is the figure which showed the state at the time of intermediate support body passing of the lifeline hook for fall prevention of FIG. 1, (a) shows the time of the hook part of a sliding direction front side passing an intermediate support body, (b) FIG. 4 is a view showing a time when a hook portion on the rear side in the sliding direction passes through the intermediate support. It is the side view which looked at the hook part periphery of the lifeline hook for fall prevention of FIG. 1 from the front side of the sliding direction. FIG. 2 is an enlarged view of the vicinity of a bent portion of a hook portion of the fall prevention lifeline hook of FIG. 1. It is the figure which looked at the rotation state of the rod-shaped body of the lifeline hook for fall prevention of FIG. 1 from upper direction. It is the figure which showed the use condition of the conventional safety latching apparatus, (a) is the figure seen from the direction perpendicular | vertical to a sliding direction, (b) is the figure seen from the sliding direction.

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

(First embodiment)
In the present embodiment, overhead work is taken as an example of high-altitude work, and when a trolley wire connected to a suspended overhead wire is used as a master rope, a fall prevention lifeline hook for mooring the lifeline to this trolley line Indicates.

  FIG. 1 shows a use state of a fall prevention lifeline hook 1 according to a first embodiment of the present invention. FIG. 2 is a view of the fall prevention lifeline hook 1 of FIG. 1 as viewed from the bottom side.

  1 and 2, a portion indicated by a two-dot chain line is a part of a trolley wire 20 as a master rope and an intermediate support 21 for connecting the trolley wire 20 to a suspension line.

  The lifeline hook 1 for preventing fall is provided with a fastening portion (connecting portion) 10 (represented only in FIG. 2) for fastening the lifeline 22 below the plate-like base portion 2. And two sets of hook parts 4 are arranged along with the direction in which trolley wire 20 is stretched up.

  The two sets of hook portions 4 include a hook-like body 8 (first linear body) bent in a hook shape at an intermediate position, and a stopper portion 6 projecting substantially vertically upward with respect to the base portion 2. (Second linear body). The hook-like body 8 includes a base end portion 8c that protrudes upward from the base portion 2 substantially in parallel with the stopper portion 6, a bent portion 8b, and a hook arm that extends toward the distal end side of the stopper portion 6. And a portion 8a (a tip portion of the first linear body).

  The hook arm portion 8 a of the hook-like body 8 can swing around the axis of the base end portion 8 c with respect to the base portion 2. The tip of the arm portion 8 a is biased so as to be in pressure contact with the pressure contact portion 6 a above the stopper portion 6. Thus, the stopper part 6 is provided in the position which suppresses rotation in the direction in which the arm part 8a is substantially orthogonal to the trolley wire 20. FIG. Thereby, an annular shape is formed by the stopper portion 6, the bowl-shaped body 8 and the base portion 2.

  In use, two sets of hook portions 4 are moored to the trolley wire 20 so that the trolley wire 20 penetrates the inside of the ring shape. Moreover, the lifeline hook 1 for fall prevention is installed with respect to the trolley wire 20 so that the direction in which the lower arm portion 8a is pressed against the stopper portion 6 is directed to the front side of the sliding. This front side is indicated by an arrow A in FIGS.

  In addition, about the structure which gives urging | biasing force to the bowl-shaped body 8, it is shown by the structure of the bottom face side of FIG. As can be seen from FIG. 2, the lower end side of the base end portion 8 c of the bowl-shaped body 8 penetrates to the lower surface side of the base portion 2 and is fastened by a nut 13. A spring 12 is provided between the nut 13 and the base portion 2. Due to the elastic force of the spring 12, the bowl-shaped body 8 is urged against the base portion 2.

  Next, the movement of the hook portion 4 when the fall prevention lifeline hook 1 passes through the intermediate support 21 will be described with reference to FIG.

  FIG. 3A shows a state in which the hook portion 4 on the front side in the sliding direction is in contact with the intermediate support body 21, and FIG. 3B shows the hook portion 4 on the rear side in the sliding direction in contact with the intermediate support body 21. The contact state is shown. As shown in FIG. 3A, when the lifeline 22 is drawn in the direction of arrow B as the worker moves, and the fall prevention lifeline hook 1 slides in the direction of arrow A, first, the sliding direction The front hook part 4 abuts on the intermediate support 21. At this time, the arm portion 8a of the saddle-shaped body 8 receives the reaction force from the intermediate support 21 and moves away from the press contact portion 6a and swings backward in the sliding direction. Thereby, the ring shape formed with the bowl-shaped body 8, the stopper portion 6, and the base portion 2 is in an open state.

  Then, after the hook portion 4 arranged on the front side in the sliding direction passes through the intermediate support body 21, the hook-like body 8 on the front side is rotated toward the original position by urging, and the arm portion 8a returns to the state where it is pressed against the pressure contact portion 6a.

Subsequently, as shown in FIG. 3B, the arm portion 8 a of the hook portion 4 on the rear side in the sliding direction comes into contact with the intermediate support 21. Then, as with the front side arm portion 8a, when the intermediate support body 21 is pressed, the rear side arm portion 8a is also opened, allowing the intermediate support body 21 to pass rearward.

  As described above, according to the lifeguard hook 1 for preventing fall according to the present embodiment, when the hook part 4 on the front side in the sliding direction is opened, the rear hook part 4 is moored on the trolley wire 20. In addition, when the hook part 4 on the rear side in the sliding direction is opened, the front side hook part 4 is moored with respect to the trolley wire 20, so that a good state is always maintained. Due to the action of the fall prevention lifeline hook 1, it is not necessary for the operator to replace the hook every time the intermediate support 21 is reached. It is possible to pass through.

  For this reason, the work that should be performed is not hindered, the work efficiency is dramatically improved, and it is not necessary to change the hand-held tool. Therefore, the safety is improved in the high-place work where the balance is easily lost.

  Subsequently, the shape of the arm portion 8a of the rod-shaped body 8 will be described with reference to FIG. FIG. 4 is an enlarged view of the periphery of the hook portion 4 of the life prevention hook 1 for preventing fall when viewed from the front side in the sliding direction. As apparent from FIG. 4, in the lifeline hook 1 for preventing fall according to the present embodiment, the bent inner diameter 40 of the bent portion 8 b of the bowl-shaped body 8 is smaller than the outer diameter 41 of the trolley wire 20. It is formed so as to be bent. Further, the bending position 30 is formed at a position higher than the contact position 31 with respect to the pressure contact portion 6a (not shown) of the stopper portion 6 of the arm portion 8a.

  Thereby, a clearance gap arises between the upper end side of the trolley wire 20, and the bending part 8b. That is, since the contact area of the trolley wire 20 with the bent portion 8b can be reduced, the friction when the saddle-like body 8 rotates while sliding on the trolley wire 20 is reduced, and the intermediate support 21 can be smoothly moved. Can pass through.

  FIG. 5 is an enlarged view of the periphery of the bent portion 8b. As can be seen from FIG. 5, in the present embodiment, the arm portion 8a is inclined downward at an angle smaller than 45 ° from the bent portion 8b toward the press contact portion 6a (not shown). Thereby, the contact area | region 20a with respect to the trolley wire 20 of the arm part 8a is settled in the range of 45 degrees from a perpendicular direction, and can reduce the resistance at the time of rocking | fluctuation. The force acting between the arm portion 8a and the upper end side of the trolley wire 20 will be further described with reference to FIG.

  FIG. 6 is a view of the periphery of the bent portion 8b of the bowl-shaped body 8 of FIG. 5 as viewed from above. As shown in FIG. 6, in order to allow the intermediate support 21 to pass rearward when the lower arm 8a is pushed and rotated rearward in the sliding direction by the intermediate support 21, the hook is temporarily removed. The saddle-shaped body 8 must be rotated to a position where the arm portion 8a gets over the upper end of the trolley wire 20. At this time, a force is applied from the arm portion 8a toward the trolley wire 20 in the direction of the arrow C in FIG. 6, and a drag force from the trolley wire 20 to the arm portion 8a in the direction of the arrow D. Occurs. When this state is seen in the side view of FIG. 5, the component in the horizontal direction is expressed by the component force fc and the component force fd with respect to the force generated in the directions of the arrow C and the arrow D.

  That is, when the downwardly tilted arm portion 8a rotates around the base end portion 8c, a vertical drag is generated between the arm portion 8a and the trolley wire 20, and among these, a horizontal component force is generated. Becomes a resistance force at the time of rotation and greatly affects its operation. Therefore, the smaller the horizontal component force, the easier the rotation. For this purpose, the direction of the vertical drag generated between the arm portion 8a and the trolley wire 20 is as close to the vertical direction as possible. Is preferred. In other words, it is preferable that the arm portion 8a is in contact with the trolley wire 20 as much as possible.

  In the fall prevention lifeline hook 1 in the present embodiment, as described above, the inclination of the arm portion 8a is formed to be 45 ° or less. Therefore, the component force fc of the horizontal component generated at the time of rotation is provided. And fd become small, and the opening and closing operation of the bowl-shaped body 8 becomes smooth.

  In addition, in the fall prevention lifeline hook 1 in the present embodiment, since the two hook portions 4 are moored with respect to the trolley wire 20, even if the direction pulled by the lifeline 22 changes, the proximal end of the rod-like body 8 The axial direction of the part 8c can maintain a direction substantially orthogonal to the direction in which the trolley wire 20 extends. As a result, the surface drawn by the locus of the lower arm portion 8a that abuts on the intermediate support 21 and rotates is always directed in a certain direction with respect to the trolley wire 20, so that it is caused by friction with the trolley wire 20 accompanying the rotation. The resistance can be kept constant, and the operation can be stabilized.

  In the configuration of the drop-preventing lifeline hook shown in the above embodiment, the arm portion 8a extends substantially linearly downward from the bent portion 8b, and substantially extends from a position exceeding the intermediate position toward the tip. As an example, a saddle shape curved to change the direction in the horizontal direction is shown.

  However, the present invention is not limited to this, and it may be formed linearly from the bent portion to the pressure contact portion. Further, it may be curved so that the whole is convex downward from the bent portion toward the pressure contact portion. Thus, when it is curved and formed so as to protrude downward, the contact area of the arm portion with respect to the trolley wire can be further reduced, and the hook-shaped body can be rotated more smoothly. .

  Further, in the above embodiment, the ring shape formed by the hook portion is shown as an example of a configuration formed in a plane substantially orthogonal to the sliding direction. It does not matter if it is tilted. Further, the planes on which the ring shapes of the two sets of hook portions are formed do not have to be parallel.

  Furthermore, in the above embodiment, the configuration in which the two sets of hook portions have the same shape is shown as an example. However, a difference in size may be provided, and the shapes of the two hook portions may be different.

  Further, in the above embodiment, the configuration of the lifeline hook for fall prevention moored to the trolley wire in the overhead wire work or the like is shown as an example, but the same effect can be obtained even if this is a rope, a wire or the like. .

  In the above-described embodiment, the configuration example including two sets of hook portions has been described. However, as long as at least two sets of hook portions are provided, a configuration including more hook portions may be used. Thus, when two or more sets of hook portions are provided, the direction in which the surface drawn by the rotation trajectory of the armrest portion is further stabilized.

  Further, in the above-described embodiment, an example in which a fastening portion for fastening a lifeline is provided on the bottom surface side of the base portion has been shown. However, this position is at least a ring formed by the hook portion when the lifeline is drawn. Any shape may be used as long as the trolley wire can hold the state where the trolley wire is close to the bent portion side, and the fastening portion may be provided at a position other than the bottom surface side.

  The present invention can pass through a support member only by pulling a mooring tool such as a hook moored to a parent rope supported by a support member provided at a predetermined interval without performing an attaching / detaching operation. Therefore, it is useful when mooring a lifeline to a parent line in a high-place work such as a structure such as a bridge, a steel tower, or an overhead wire.

1 Lifeline hook for preventing fall 2 Base part 4 Hook part (first and second linear bodies)
6 Stopper (second linear body)
6a Press-contact part 8a Arm part (tip part)
8 Rod-like body (first linear body)
8c Base end part 10 Fastening part 12 Spring 20 Trolley wire (master rope)
21 Intermediate support body 22 Lifeline 30 Bending position 31 Contact position 40 Inner diameter 41 Outer diameter

Claims (4)

A lifeline hook for fall prevention to which a lifeline is connected, and is fixed to the intermediate support at a predetermined interval and slidably moored along a masterline stretched in a lateral direction,
A base part;
The first linear body includes first and second linear bodies protruding above the base portion, and the first linear body swings around a base end portion extending upward from the base portion as an axis. The first linear body and the second linear body are urged so as to come into pressure contact with the tip portion from the rear side in the sliding direction of the side surface of the second linear body. An annular shape through which the parent rope can be penetrated by the base portion, at least two sets of hook portions arranged in a direction in which the parent rope is stretched , and
A connecting portion provided on the lower side of the base portion to which the lifeline is connected;
The lifeline hook for fall prevention characterized by comprising. The first linear body has a bent portion formed between the proximal end portion and the distal end portion,
The bent portion is formed so that an inner diameter of the bent portion is smaller than an outer diameter of the parent rope, and is higher than a pressure contact portion of the first linear body with respect to the second linear body. The lifeline hook for preventing fall according to claim 1, wherein the hook is formed at a position. The lifeline hook for fall prevention according to claim 2, wherein the tip end portion is inclined downward at an angle of 45 ° or less from the bent portion toward the press-contact portion. The lifeline hook for fall prevention according to claim 3, wherein the tip portion is curved so as to protrude downward between the bent portion and the pressure contact portion.