JP4974750B2 - Safety band mounting jig and safety band mounting method - Google Patents

Description

  The present invention relates to a jig and method for attaching a safety band to a suspension bolt.

  Workers who work outdoors at building sites use safety belts. The safety belt includes a waist belt, a hook, and a rope. The rope connects the torso belt and the hook. An operator winds a torso belt around his / her body and hooks a hook at a predetermined location on the work site. Even when the worker steps off his / her foot, the worker is suspended through the torso belt, the rope and the hook, and the fall is prevented. There is also a safety belt in which a harness is used instead of the trunk belt. There is also a safety belt that uses a woven belt instead of a rope.

  In building construction, cable ducts, air conditioning ducts, and the like are fixed to suspension bolts that hang from the ceiling. Further, a finishing material for a suspended ceiling (referred to as “light sky”) is fixed to the suspension bolt. During these fixed tasks, the worker climbs on the stepladder. An operator may work on a scaffolding board spanned between two stepladders. Building construction involves working at high altitudes both indoors and outdoors. In indoor work, a means for preventing a worker from falling is desired.

  Japanese Patent Laid-Open No. 7-19290 discloses a metal fitting fixed to a suspension bolt. A safety belt is attached to the suspension bolt through this metal fitting. Even when the worker steps off his / her foot, the worker can be suspended from the suspension bolt by the metal fitting and the safety belt, so that the worker can be prevented from falling.

Japanese Patent Application Laid-Open No. 2005-351399 discloses a hooking device fixed to a suspension bolt. A hook of a safety belt is passed through the hole of the latching device. Even when the worker steps off his / her foot, the worker is suspended from the suspension bolt by the hooking device and the safety belt, so that the worker can be prevented from falling.
JP-A-7-19290 JP 2005-351399 A

  In the metal fitting disclosed in Japanese Patent Laid-Open No. 7-19290, the metal fitting is fixed to the suspension bolt by the tightening force of the fastening bolt. When fixing the bracket, the operator must turn the tightening bolt. When the bracket is removed from the suspension bolt, the operator must turn the clamping bolt in the opposite direction. In indoor work, a safety belt is attached to the suspension bolt close to the work position. Each time the work position is changed, the operator must turn the tightening bolt in the reverse direction to remove the bracket from the suspension bolt, and then turn the tightening bolt to fix the bracket to the other suspension bolt. This operation is troublesome. Due to annoyance, the worker may neglect to attach the safety belt to the suspension bolt.

  The operator uses his hands to fix the bracket to the suspension bolt on an unstable scaffold. At this time, the worker cannot support the body with his hand. This fixing work is painful for the operator. There is also a risk that the operator may step on the foot during the fixing work.

  Further, with this metal fitting, there is a possibility that an operator may mistakenly recognize that the tightening bolt is incomplete even though the fastening bolt is not sufficiently tightened and the fixing to the suspension bolt is incomplete. In the case where the fixing is incomplete, when the operator steps on the foot, the metal fitting is detached from the suspension bolt and the operator falls.

  In order for the latching device disclosed in Japanese Patent Laid-Open No. 2005-351399 to be removed from the suspension bolt, the hook of the safety belt needs to be removed from the hole. Each time the work position is changed, the operator must remove the hook from the hole, remove the latching device from the suspension bolt, fix the latching device to the other suspension bolt, and pass the hook through the hole. This operation is troublesome. Due to annoyance, the worker may neglect to attach the safety belt to the suspension bolt.

  After the work using the latching device is completed, the hook is first removed from the hole, and then the latching device is removed from the suspension bolt. At this stage, the latching device is separated from the safety belt. Therefore, the worker may carry only the safety belt and forget to carry the latching device. An operator may lose the latching device.

  An object of the present invention is to provide a safety band attaching jig that does not cause erroneous recognition of the fixed state to the suspension bolt and that is excellent in operability.

The safety band mounting jig according to the present invention is:
(1) A main plate having a first recess in which a groove corresponding to a male screw of a suspension bolt is engraved,
(2) A lid plate having a second recess with a groove corresponding to the male thread of the suspension bolt and pivotally attached to the main plate;
(3) It is pivotally attached to the main plate and can rotate between the first position and the second position. When in the first position, the main plate and the lid plate fitted to the main plate are sandwiched. A holding body that prevents the lid plate from being separated from the main plate and allows the lid plate to be separated from the main plate when in the second position;
(4) A lock mechanism that allows the holding body to rotate from the second position to the first position and prevents movement of the holding body from the first position to the second position, and (5) any of the main plate and the lid plate It is provided on either side and includes a locking portion for locking the hook of the safety belt. The jig is configured such that the suspension bolt is held by the first recess and the second recess when the main plate and the lid plate are brought together.

  Preferably, the lock mechanism includes a movable pin and a spring that biases the movable pin. With this jig, the claw formed on the main plate or lid plate is locked by the movable pin getting over the spring bias when the clamping body rotates from the second position to the first position. Becomes effective.

  The safety band attaching jig is fixed to the suspension bolt by the holding body holding the main plate and the lid plate. In a state where the sandwiching body does not sandwich the main plate and the lid plate, the jig is detached from the suspension bolt. Therefore, although the jig is not completely fixed to the suspension bolt, the operator does not erroneously recognize it as complete.

  In this jig, the hook of the safety belt is locked to the locking portion, and the attachment and detachment to the hanging bolt of the jig is achieved. The operation of attaching / detaching the jig to / from the suspension bolt is simple. The operator does not shy away from this operation. With this jig, a high wearing rate of a safety belt can be achieved. Since the hook is always locked to the jig, the jig is always carried when the worker carries the safety belt. Loss of jig is unlikely to occur. Moreover, since the operator can perform this attachment / detachment with one hand, the body can be supported with the other hand even during the attachment / detachment operation. Therefore, the operator does not step on the foot during the attaching / detaching work.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a perspective view showing a safety band mounting jig 2 according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a partially cutaway front view thereof. The jig 2 includes a main plate 4, an upper support plate 6, a lower support plate 8, a first shaft pin 10, a locking portion 12, a lid plate 14, a sandwiching body 16, a second shaft pin 18, and a lock mechanism 20. ing. This jig 2 is made of a metal material. A typical metallic material is alloy steel.

  The main plate 4 extends in the left-right direction in FIG. 2, and extends in the up-down direction (vertical direction) in FIG. The main plate 4 has a first recess 22. The first recess 22 extends in the vertical direction. The horizontal cross-sectional shape of the first recess 22 is a substantially semicircle. A large number of grooves 24 are carved on the inner peripheral surface of the first recess 22. The groove 24 corresponds to a male screw of a suspension bolt described later. As shown in FIG. 3, the main plate 4 includes a claw 26 and a notch 28. The upper edge of the nail 26 is inclined upward in FIG. There is a step between the claw 26 and the notch 28.

  The upper support plate 6 and the lower support plate 8 extend in the horizontal direction. The upper support plate 6 and the lower support plate 8 are formed integrally with the main plate 4. The main plate 4, the upper support plate 6, and the lower support plate 8 are formed by bending one plate. A first shaft pin 10 is bridged between these support plates. The upper support plate 6 includes a stopper 30.

  The locking portion 12 is located below the main plate 4. The locking portion 12 is continuous with the main plate 4. The locking portion 12 is formed integrally with the main plate 4. The locking part 12 includes an opening 32.

  The lid plate 14 extends in the left-right direction in FIG. 2, and extends in the up-down direction (vertical direction) in FIG. The lid plate 14 has a second recess 34. The second recess 34 extends in the vertical direction. The horizontal cross-sectional shape of the second recess 34 is a substantially semicircle. A large number of grooves 36 are formed on the inner peripheral surface of the second recess 34. The groove 36 corresponds to a male screw of a suspension bolt described later.

  The lid plate 14 includes a cylindrical portion 38 at the right end in FIG. The cylinder part 38 is formed by bending and welding a plate. The cylinder portion 38 extends in the vertical direction. The first shaft pin 10 is passed through the cylindrical portion 38. The inner diameter of the cylindrical portion 38 is slightly larger than the outer shape of the first shaft pin 10. The lid plate 14 is pivotally attached to the main plate 4 by the first shaft pin 10. The lid plate 14 is rotatable with respect to the main plate 4 around the first shaft pin 10. The direction of rotation is the direction of arrows A and B in FIG. FIG. 2 shows a state in which the lid plate 14 is most rotated in the direction of the arrow A. In FIG. 2, the lid plate 14 is aligned with the main plate 4. In this state, the first recess 22 and the second recess 34 form a loop. FIG. 4 shows a state in which the lid plate 14 is rotated in the direction of arrow B from the state shown in FIG. In FIG. 4, the lid plate 14 is separated from the main plate 4. Excessive rotation of the lid plate 14 in the direction of arrow B is prevented by the stopper 30.

  The lid plate 14 is not biased in the direction of the arrow A or the direction of the arrow B. In other words, the rotation of the lid plate 14 with respect to the main plate 4 is free. The lid plate 14 may be biased in the direction of arrow B by a biasing means such as a spring. The lid plate 14 is preferably not biased in the direction of arrow A.

  As shown in FIG. 2, the sandwiching body 16 includes a back wall 40, a side wall 42, and a front wall 44. The back wall 40 and the front wall 44 are connected via the side wall 42. The back wall 40 and the front wall 44 are spaced apart from each other by a predetermined distance. The cross-sectional shape of the sandwiching body 16 in plan view is substantially “U” shape. As shown in FIG. 3, a long hole 46 a is formed in the back wall 40. As shown in FIG. 1, a long hole 46 b is also formed in the front wall 44. The shape of the long hole 46a is the same as the shape of the long hole 46b. The long holes 46a and 46b extend in the vertical direction in FIG. In the front view, the position of the long hole 46a coincides with the position of the long hole 46b. The sandwiching body 16 further includes a rivet 48. The rivet 48 is bridged between the back wall 40 and the front wall 44.

  The sandwiching body 16 is pivotally attached to the main plate 4 by a second shaft pin 18. The sandwiching body 16 is rotatable with respect to the main plate 4 around the second shaft pin 18. The direction of rotation is the direction of arrows C and D in FIG. 1 to 3 show a state in which the sandwiching body 16 is most rotated in the direction of the arrow C. 1 to 3, the main plate 4 and the lid plate 14 are sandwiched between the back wall 40 and the front wall 44. FIG. 5 shows a state in which the sandwiching body 16 is rotated in the direction of the arrow D from the state shown in FIG. In FIG. 5, the lid plate 14 is not sandwiched between the sandwiching bodies 16.

  As shown in FIG. 3, the lock mechanism 20 includes a movable pin 50 and a spring 52. The movable pin 50 is passed through the long holes 46a and 46b. The movable pin 50 is movable inside the long holes 46a and 46bb. The moving direction of the movable pin 50 is the vertical direction in FIG.

  The spring 52 includes a coil 54, a first contact portion 56, and a second contact portion 58. The coil 54, the first contact portion 56, and the second contact portion 58 are formed by bending one wire. A rivet 48 is passed through the coil 54. A spring 52 is attached to the holding body 16 by a rivet 48. The first contact portion 56 is in contact with the side wall 42 of the sandwiching body 16. The second contact portion 58 is in contact with the movable pin 50. The movable pin 50 is urged downward by the spring 52 in FIG.

  FIG. 6 shows a state in which the holding body 16 is rotated in the direction of arrow D from the state shown in FIG. In the present invention, the position of the clamping body 16 shown in FIG. 3 is referred to as a first position, and the position of the clamping body 16 shown in FIG. 6 is referred to as a second position. As shown in FIG. 6, the movable pin 50 is in contact with the claw 26 in the second position. The gravitational force of the sandwiching body 16 works in the direction of rotating the sandwiching body 16 in the direction of arrow C. On the other hand, the movement of the movable pin 50 is blocked by the spring 52. Since the urging force of the spring 52 is larger than the gravity acting on the sandwiching body 16, the sandwiching body 16 is stationary at the second position. In front view, the lid plate 14 and the front wall 44 do not overlap. In other words, the clamping body 16 does not clamp the lid plate 14.

  When the operator pushes the clamping body 16 in the direction of arrow C in FIG. 6, the movable pin 50 moves to the right. Since the claw 26 rises to the right, the movable pin 50 also moves upward against the urging force of the spring 52 as it moves to the right. When the holding body 16 is further pressed, the movable pin 50 gets over the claw 26 and fits into the notch 28. Thus, the transition of the sandwiching body 16 from the second position to the first position is completed. In the first position, since the movable pin 50 is biased downward by the spring 52, the movable pin 50 cannot be easily removed from the notch 28.

  When the operator pushes the movable pin 50 in the upward direction in FIG. 3, the movable pin 50 moves upward against the biasing force of the spring 52 and comes out of the notch 28. When the operator further pushes the clamping body 16 in the direction of arrow D, the clamping body 16 shifts from the first position to the second position.

  FIG. 7 is a front view showing how the jig 2 of FIG. 1 is used. FIG. 7 also shows a suspension bolt 62 suspended from the ceiling 60. Also shown in FIG. 7 is a safety band hook 64. The hook 64 is passed through the opening 32 of the locking portion 12.

  When the operator fixes the jig 2 to the suspension bolt 62, the clamping body 16 is in the second position (see FIG. 6), and the lid plate 14 is separated from the main plate 4. The suspension bolt 62 is applied to the first recess 22 (see FIG. 2). The operator rotates the lid plate 14 in the direction of arrow A, and aligns the lid plate 14 with the main plate 4. By the rotation, the second concave portion 34 of the lid plate 14 comes into contact with the suspension bolt 62. The suspension bolt 62 is surrounded by the first recess 22 and the second recess 34. The operator further rotates the holding body 16 in the direction of arrow C (see FIG. 6). By the rotation, the sandwiching body 16 reaches the first position (see FIG. 3). In the first position, the main plate 4 and the lid plate 14 are held by the holding body 16. By the clamping, the rotation of the lid plate 14 is prevented. In the first position, the suspension bolt 62 is held by the first recess 22 and the second recess 34. The groove 24 of the first recess 22 and the groove 36 of the second recess 34 mesh with the male screw of the suspension bolt 62. The jig 2 is fixed to the suspension bolt 62 by this meshing. When the worker steps off his / her foot, the worker is suspended by the suspension bolt 62 via the safety belt and the jig 2. This jig 2 prevents a crash.

  When the operator removes the jig 2 from the suspension bolt 62, the movable pin 50 is pushed up with the clamping body 16 in the first position, and the clamping body 16 is rotated in the direction of arrow D (see FIG. 3). . By the rotation, the clamping body 16 reaches the second position. The operator further rotates the lid plate 14 in the direction of arrow B (see FIG. 2). The second recess 34 is separated from the suspension bolt 62 by the rotation.

  In this jig 2, the holding body 16 prevents the lid plate 14 from rotating when fixed to the suspension bolt 62. Further, the lock mechanism 20 prevents the clamping body 16 from rotating. In this jig 62, a double safety mechanism functions.

  The operation of attaching / detaching the jig 2 to / from the suspension bolt 62 is extremely simple. The operator can attach and detach the jig 2 with one hand. The operator does not feel bothered by this operation. Simple operation contributes to the wearing rate of the safety belt.

  In this jig 2, the hook 64 can be attached to and detached from the suspension bolt 62 while the hook 64 is passed through the opening 32. In this respect as well, the operator does not feel bothered by the attaching / detaching operation. Moreover, since the jig 2 is carried while attached to the safety belt, the operator does not lose or misplace the jig 2.

  In the jig 2, the lid plate 14 is free with respect to the main plate 4 when the clamping body 16 is in the second position. When the operator releases his hand from the jig 2 in a state where the lid plate 14 is fitted to the main plate 4 and the holding body 16 is in the second position, the jig 2 falls off the suspension bolt 62 due to its own weight. Therefore, although the fixing of the jig 2 to the suspension bolt 62 is incomplete, the operator does not erroneously recognize it as complete. This jig 2 contributes to the safety of the operator. The lid plate 14 may be biased against the main plate 4. An example of the biasing means is a kick spring. The kick spring can be attached to the first shaft pin 10.

  FIG. 8 is a front view showing a safety belt attaching jig 66 according to another embodiment of the present invention, and FIG. 9 is an enlarged cross-sectional view taken along line IX-IX in FIG. The mounting jig 66 includes a main plate 68, a lid plate 70, and a magnet 72. The structure of the mounting jig 66 other than the main plate 68, the cover plate 70 and the magnet 72 is the same as those of the safety band mounting jig 2 shown in FIG. The magnet 72 has a plate shape. The magnet 72 is joined to the main plate 68. The lid plate 70 is attracted to the main plate 68 by the magnetic force of the magnet 72. A cutout 74 is formed in the lid plate 70.

  With this attachment jig 66, the operator pushes the fingernail into the notch 74 and opens the lid plate 70. The operator places a suspension bolt between the main plate 68 and the lid plate 70 and releases the finger from the lid plate 70. The lid plate 70 is attracted to the magnet 72, and the suspension bolt is sandwiched between the main plate 68 and the lid plate 70. The magnet 72 may be joined to the lid plate 70.

FIG. 1 is a perspective view showing a safety belt attaching jig according to an embodiment of the present invention. FIG. 2 is a plan view showing the jig of FIG. FIG. 3 is a partially cutaway front view showing the jig of FIG. FIG. 4 is a plan view showing the jig of FIG. FIG. 5 is a front view showing the jig of FIG. FIG. 6 is a partially cutaway front view showing the jig of FIG. FIG. 7 is a front view showing how the jig of FIG. 1 is used. FIG. 8 is a front view showing a safety band mounting jig according to another embodiment of the present invention. 9 is an enlarged cross-sectional view along the line IX-IX in FIG.

Explanation of symbols

2, 66 ... Safety belt mounting jig 4, 68 ... Main plate 10 ... First shaft pin 12 ... Locking portion 14, 70 ... Lid plate 16 ... Clamp 18 .... Second shaft pin 20 ... Lock mechanism 22 ... First recess 26 ... Claw 28 ... Notch 34 ... Second recess 38 ... Tube 40 ... Back wall 42 ... Side wall 44 ... Front wall 46a, 46b ... Long hole 50 ... Movable pin 52 ... Spring 72 ... Magnet 74 ... Notch

Claims (3)

A main plate having a first recess in which a groove corresponding to a male screw of a suspension bolt is engraved;
A lid plate that has a second recess inscribed with a groove corresponding to the male thread of the suspension bolt, and is pivotally attached to the main plate;
It is pivotally attached to the main plate and can rotate between the first position and the second position. When in the first position, the main plate and the lid plate fitted to the main plate are sandwiched between the lids. A clamping body that prevents the plate from being separated from the main plate and allows the lid plate to be separated from the main plate when in the second position;
Provided on either the main plate or the lid plate that allows the holding body to rotate from the second position to the first position and prevents the holding body from moving from the first position to the second position. And has a locking part to which the hook of the safety belt is locked,
When the main plate and the lid plate are combined, the suspension bolt is held by the first recess and the second recess ,
The lock mechanism is composed of a movable pin provided in the sandwiching body and a spring that biases the movable pin,
The main plate or lid plate is formed with notches and claws for engagement,
The lock by the lock mechanism is
When the clamping body rotates from the second position to the first position, the movable pin is effective by overcoming the claw and engaging the notch against the spring bias, and the movable pin is biased by the spring. A safety band mounting jig for suspension bolts, which is configured to be released by overcoming the nail and getting out of the notch against the above . A magnet is further provided, and the magnet is disposed so as to be positioned between the main plate and the lid plate when the main plate and the lid plate are combined, and the magnet attaches the lid plate to the main plate. The safety belt mounting jig according to claim 1 , wherein the safety belt mounting jig is configured to be relatively adsorbed. A safety band to a suspension bolt, comprising: a step in which a hook of a safety band is locked to the locking portion of the safety band attachment according to claim 1; and a step in which the safety band attachment is fixed to a suspension bolt. Mounting method.

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