JP2009041742A - Fall prevention tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fall prevention tool capable of surely preventing fall by holding a bolt and a nut and allowing them to screw together while holding them. <P>SOLUTION: A typical configuration of the fall prevention tool of this invention is provided with a holding part 100 for holding the bolt 20 or the nut 30 and a suspension part 200, connected with the holding part, capable of suspending the holding part. The holding part is provided with a base body 110 having a bottomed hole 112 into which the bolt or the nut can be unrotatably inserted, a shutter 150 having a through hole 152 into which the bolt or the nut can be unrotatably inserted and a rotation mechanism for relatively rotating the shutter and the base body while center axes of the bottomed hole and the through hole are coincided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fall prevention tool for preventing a bolt or nut from dropping mainly in high-altitude work.

  When working at high places, such as assembling and repairing steel towers and structures, and attaching and detaching pole poles, if materials such as bolts, nuts, and members are dropped, they will be damaged. May cause damage to buildings, structures and vehicles below. In particular, when working on steel towers and utility poles, the work is often performed with thick insulating gloves. Then, small things such as bolts and nuts are difficult to grasp and may be removed.

  If there is a margin in the construction site, there may be a case where there is no problem even if the material falls by setting the work section in a range where the material is supposed to fall and setting it to a state where there is nothing below. However, it is not always possible to secure a sufficient work section, and a structure such as a storeroom cannot be easily moved. For this reason, it is necessary to take measures to prevent the fall in order to prevent it from dropping.

  As a fall prevention measure that is often implemented in the present situation, a storage tool bag is installed (suspended) immediately below the work position, and in the unlikely event that material is dropped, it is dropped into the tool bag. In addition, it is also possible to use a fall prevention net provided with a protruding post on a steel frame or the like and a net attached to this support.

Further, Patent Document 1 (Japanese Patent Laid-Open No. 2005-287168) includes a holding body that holds a bolt by holding a screw thread, and is attached to the bolt when replacing the nut to prevent the bolt from dropping. Is disclosed. According to Patent Document 1, it is possible to prevent a wire from dropping due to a drop-out of a bolt and easily replace a corroded nut.
JP 2005-287168 A

  However, when the tool bag is used in the conventional drop prevention measures, the work position is frequently changed, so that there is a problem that it is troublesome to reset the tool bag each time. In addition, when trying to install a tool bag, the place where it can be installed at a high place is extremely limited, so it may not be installed directly below the work position. Furthermore, the tool bag may be unstable due to wind, and the falling material cannot always be collected. In addition, when using a dredged fall prevention net as a fall prevention measure, the dropped material may jump off the net and jump out to the outside, and the certainty of collection is not necessarily high. In addition, there is a method of enclosing all four working places with a net, but there is a problem that it is costly and troublesome.

  The configuration described in Patent Document 1 is effective for removing a bolt. However, the bolts and nuts cannot be held when attaching and detaching, and if they are removed, the fall cannot be prevented.

  Then, this invention aims at providing the fall prevention tool which can prevent fall reliably by hold | maintaining a volt | bolt and a nut, and enabling them to screw together in the hold | maintenance state. .

  In order to solve the above problems, a typical configuration of the fall prevention device according to the present invention includes a holding portion that holds a bolt or a nut, and a hanging portion that is connected to the holding portion and can suspend the holding portion. The holding portion includes a base having a bottomed hole into which a bolt or a nut can be inserted in a non-rotatable manner, a shutter having a through hole into which the bolt or the nut can be inserted into a non-rotatable state, and a central axis of the bottomed hole and the through hole. And a rotating mechanism for relatively rotating the shutter and the base body in a state in which they are matched. The opening shape of the bottomed hole and the through hole only needs to be able to insert the bolt head or nut in a non-rotatable manner, for example, even if a groove corresponding to the polygonal corner of the bolt head or nut is formed inside the circular hole. Good.

  According to the said structure, a volt | bolt or a nut is accommodated in a bottomed hole so that rotation is impossible. Then, the bolt head or the nut can be held inside the bottomed hole by rotating the shutter and the base relatively and shifting the phase of the through hole of the shutter and the bottomed hole of the base. Then, by connecting the hanging part to the worker's body and surrounding structures, even if the worker removes the holding part, the bolt or nut is suspended, so that the fall can be prevented.

  In addition, since the holding portion holds the bolt or nut with the screw portion exposed, the bolt and the nut can be screwed together by rotating the holding portion while holding the bolt or nut. That is, by using two fall prevention devices according to the present invention, one of the fall prevention devices holds a bolt and the other of the fall prevention devices holds a nut, and is screwed to some extent. Bolts and nuts are held in some form and do not fall. From these things, it can prevent falling reliably.

  Further, the bottomed hole and the through hole are polygonal, and the rotation mechanism may have a biasing means for biasing toward the phase where the corners of the bottomed hole and the polygon of the through hole are shifted. .

  As a result, when the operator releases the hand, the bottomed hole of the base and the through hole of the shutter are out of phase, and the bolt head or nut is held inside the bottomed hole. Thereby, even if it is a case where an operator removes a holding | maintenance part, it can prevent falling more reliably.

  The rotation mechanism may include a cylindrical portion that is an outer peripheral surface of the bottomed hole of the base, a sleeve that is fixed to the shutter, and a locking portion that holds the sleeve rotatably attached to the cylindrical portion. Good. It is an example of the concrete structure of a rotation mechanism. According to the above configuration, the bottomed hole and the through hole can be easily rotated on the same central axis.

  It is preferable that the hanging part is connected to the holding part so as to be rotatable. Thereby, when an operator rotates a holding | maintenance part and makes a volt | bolt and a nut screw together, it can prevent that a hanging part becomes the trouble of the rotation.

  According to the fall prevention tool concerning the present invention, it is possible to hold bolts and nuts and to screw them in the held state, thereby reliably preventing these drops.

  Examples of the fall prevention device according to the present invention will be described. Note that dimensions, materials, and other specific numerical values shown in the following examples are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified.

  FIG. 1 is a diagram illustrating the overall configuration of the fall prevention tool. The fall prevention tool 10 shown in the drawing is composed of a holding portion 100 that holds the head 21 or the nut 30 of the bolt 20 and a hanging portion 200 that can suspend the holding portion 100. In the present embodiment, the two fall prevention devices 10 are collectively connected to the coil strap 40.

  2A and 2B are diagrams illustrating the holding unit 100. FIG. 2A is an exploded side sectional view of the holding unit, FIG. 2B is a diagram illustrating the rotation mechanism, and FIG. It is an external perspective view. FIG. 3 is a view showing a state where a bolt or a nut is held, FIG. 3 (a) is a view showing a state where a bolt head 21 is held, and FIG. 3 (b) is a view showing a state where a nut is stored. .

  As shown in FIG. 2A, the holding unit 100 includes a base body 110 having a bottomed hole 112, a sleeve 130, and a shutter 150 having a through hole 152.

  The base 110 has a cylindrical portion 114 on the outer peripheral surface of the bottomed hole 112. A cylindrical portion 116 is provided behind the bottomed hole 112, and a knurled gripping portion 116a is formed on the outer peripheral surface thereof. Further, a rotary joint 108 for rotatably connecting the hanging portion 200 is provided on the bottom surface of the bottomed hole 112, that is, the central portion on the back side of the base 110.

  A knurled gripping portion 150 a is formed on the outer peripheral surface of the shutter 150. Therefore, the worker can easily rotate the shutter 150 and the base 110 relatively even when wearing gloves. The shutter 150 can be rotated by inserting the bolt head 21 or the nut 30 into the through hole 152 and twisting the base 110 and the bolt head 21 or the nut 30.

  As shown in FIG. 2B, the bottomed hole 112 and the through hole 152 have hexagonal openings in this embodiment, and the bolt head 21 or the nut 30 can be inserted in a non-rotatable manner. . The shutter 150 is rotatable relative to the base body 110 with the center axes of the bottomed hole 112 and the through hole 152 aligned. Then, the bolt head 21 or the nut 30 can be inserted up to the bottomed hole 112 in a state in which the phases of the bottomed hole 112 and the through hole 152 coincide with each other.

  Then, the bolt head or the nut can be held inside the bottomed hole by rotating the shutter and the base relatively and shifting the phase of the through hole of the shutter and the bottomed hole of the base. Then, by connecting the hanging part to the worker's body and surrounding structures, even if the worker removes the holding part, the bolt or nut is suspended, so that the fall can be prevented.

  Here, the depth of the bottomed hole 112 may be deep enough to contain the bolt head 21 or the nut 30. There is no limitation on the depth of the through hole 152 (thickness of the shutter 150), but it is not necessary to be deep.

  The opening shape of the bottomed hole and the through hole only needs to be able to insert the bolt head or nut in a non-rotatable manner, for example, even if a groove corresponding to the polygonal corner of the bolt head or nut is formed inside the circular hole. Good.

  Next, the rotation mechanism will be described. The sleeve 130 is attached to the cylindrical portion 114 and can rotate by sliding. Further, the sleeve 130 is fixed to the shutter 150 so that the shutter can rotate with respect to the cylindrical portion 114. The bottomed hole 112 and the center of the cylindrical portion 114 are aligned, and the through hole 152 and the center of the shutter 150 are aligned. For these reasons, the bottomed hole 112 and the through hole 152 rotate on the same central axis.

  As shown in FIG. 2B, a long hole 132 is formed in the sleeve 130, and the tip of the pin 134 erected on the cylindrical portion 114 is disposed so as to be positioned in the long hole 132. That is, the pin 134 and the long hole 132 function as a locking portion that holds the sleeve 130 rotatably attached to the cylindrical portion 114. Further, the pin 134 and the long hole 132 also function as a defining portion that determines a relative rotation movable range between the base 110 and the shutter 150.

  Further, the cylindrical portion 114 and the sleeve 130 are provided with spring hooking pins 136 and 138, respectively, and a tension spring 140 as an example of an urging means is passed over. Due to the biasing force of the tension spring 140 and the movable range defined by the pin 134 and the long hole, the sleeve 130 (and thus the shutter 150) is in a phase in which the polygonal corners of the bottomed hole 112 and the through hole 152 are shifted. It is energized towards.

  As a result, as shown in FIG. 2C, the phase of the bottomed hole 112 of the base 110 and the through hole 152 of the shutter 150 are out of phase when the operator releases his hand, and the bolt head 21 or the nut 30 is shifted. Is held in the bottomed hole 112. Thereby, even if it is a case where an operator removes a holding | maintenance part, it can prevent falling more reliably.

  According to the above configuration, as shown in FIG. 3A, the male screw portion 22 of the bolt 20 protrudes from the through hole 152 while being held by the holding portion 100. Further, as shown in FIG. 3B, the female thread portion 31 of the nut 30 is exposed in the through hole 152 in a state of being held by the holding portion 100. Therefore, in either case, the bolt 20 and the nut 30 can be screwed together by holding and rotating the holding portion 100 while holding it. That is, by using two fall prevention devices according to the present invention, one of the fall prevention devices holds a bolt and the other of the fall prevention devices holds a nut, and is screwed to some extent. Bolts and nuts are held in some form and do not fall. From these things, it can prevent falling reliably.

  As shown in FIG. 1, the hanging part 200 is a cable body for connecting the holding part 100 to a worker's body and surrounding structures. In this embodiment, the hanging part 200 is constituted by a wire having loops formed at both ends. ing. One end of the hanging part 200 is connected to the rotary joint 108 attached to the holding part 100, and the other end is attached to the ring 41 of the coil strap 40. In addition to wires, cords, belts, chains, etc. can be used as the cord.

  In the coil strap 40, a ring 41 for attaching the hanging part 200 is attached to one end of the coil wire 42, and an eggplant 43 is attached to the other end. In the present embodiment, two fall prevention devices 10 are connected to the ring 41, and the bolts 20 and the nuts 30 are respectively held by the pair of fall prevention devices 10 to perform attachment / detachment work.

  By making the coil wire 42 extendable and contractible, the movable range of the worker can be expanded, and the attaching / detaching operation of the bolt 20 and the nut can be facilitated. In addition to the coil wire, a take-up type wire that can be fed can be suitably used. The eggplant 43 is not limited to this, and may be attached to an operator's body (such as a safety belt) or a surrounding structure. Therefore, for example, a hooking portion such as a carabiner or a hook may be used, a loop may be formed and attached to an operator's wrist or the like, or a magnet may be attached and attached to a steel tower.

  In this embodiment, since the hanging part 200 of the fall prevention device 10 is connected to the coil strap 40 and the coil strap 40 is attached to a worker or the like, the fall prevention device 10 is indirectly attached to the worker. It can be said that it is attached. However, it goes without saying that a locking portion or the like for directly attaching the tip of the hanging portion 200 (the side opposite to the holding portion 100) to a worker or the like may be provided. There is no difference.

  The procedure of the high place work using the fall prevention tool 10 of the said structure is demonstrated. First, when attaching the bolt 20, the worker attaches the eggplant 43 of the coil strap 40 to the safety belt of his body, holds the bolt head 21 on one fall prevention device 10, and attaches the other fall prevention device 10 to the other fall prevention device 10. The nut 30 is held. Thereby, even if an operator should remove the holding part (the bolt 20 or the nut 30), the bolt 20 or the nut 30 is suspended by the hanging part 200, so that the fall can be prevented.

  Then, the bolt 20 is inserted into a place to be attached, and the nut 30 is screwed to the tip thereof. At this time, since the holding part 100 holds the bolt 20 or the nut 30 in a state where the screw parts (the male screw part 22 and the female screw part 31) are exposed, they can be screwed together while being held. it can. Note that the screwing is rotated together with the holding unit 100, but can be smoothly rotated by the action of the rotary joint 108. If the bolt 20 and the nut 30 are screwed together as many as three, they will no longer fall off. Then, by removing both the holding portions 100 and tightening the bolt 20 and the nut 30 using a wrench, the attaching operation is completed.

  Next, when removing the bolt, the worker first loosens the bolt 20 and the nut 30 using a wrench, and rotates the male screw portion 22 to a position where the tip of the male screw portion 22 enters the nut 30. And the holding | maintenance part 100 of the two fall prevention devices 10 is attached to the bolt head 21 and the nut 30, and the whole holding | maintenance part 100 is rotated and isolate | separated. Then, the bolt 20 or the nut 30 is taken out from the holding unit 100 in the tool bag, and the removing operation is completed.

  As described above, the bolt 20 and the nut 30 are always held in some form, and do not fall even if the hands are released. From these things, it can prevent falling reliably.

[Other Embodiments]
In the above embodiment, the configuration in which the long hole 132 is exposed on the outer peripheral surface of the sleeve 130 has been described. On the other hand, FIG. 4 is a diagram showing another configuration example of the holding unit 100, and an exterior ring 160 is further arranged outside the sleeve 130. The outer ring 160 has the same outer diameter as that of the cylindrical portion 116 and the shutter 150 of 110, so that no special fixing is required. By comprising in this way, it can prevent that foreign materials, such as sand, mix in a rotation mechanism, and can be made maintenance-free with respect to an operator.

  FIG. 5 is a diagram showing another configuration for connecting the rope connected to the holding portion to the worker's body. In the said embodiment, the hanging part 200 which is a cable body was attached to the ring 41 of the coil strap 40, and it was demonstrated that the eggplant 43 of a coil strap was connected with a worker's body (for example, safety belt).

  On the other hand, in FIG. 5, the hanging part 200 is connected to a wristband 300 for attaching to the wrist of the worker. The wristband 300 includes a hook-and-loop fastener 302 and can be fixed in a state where the wrist of the worker is wound. By comprising in this way, the hanging part 200 can be shortened and the handling of an operator improves. In addition, even if an operator removes the holding unit 100, the holding unit 100 is suspended near the hand, so that the operation can be easily continued.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above description and drawings, hexagon bolts and hexagon nuts are used for explanation, but square bolts, octagon bolts, hexagon socket bolts, and the like can also be targeted.

  The present invention can be used mainly as a bolt or nut drop prevention tool in high-altitude work.

It is a figure explaining the whole structure of a fall prevention tool. It is a figure explaining a holding part. It is a figure which shows the state holding the volt | bolt or the nut. It is a figure which shows the other structural example of a holding | maintenance part. It is a figure which shows the other structure for connecting the rope connected with the holding | maintenance part to a worker's body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fall prevention tool, 100 ... Holding part, 102 ... Cylindrical body, 104 ... Open end, 106 ... Wall surface, 108 ... Rotary joint, 110 ... Base | substrate, 112 ... Bottomed hole, 114 ... Cylindrical part, 116 ... Cylindrical part, 116a ... gripping part, 130 ... sleeve, 132 ... long hole, 134 ... pin, 136 ... spring hook pin, 138 ... spring hook pin, 140 ... tension spring, 150 ... shutter, 150a ... grip part, 152 ... through hole, 160 ... exterior ring, 20 ... bolt, 200 ... hanging part, 21 ... head, 22 ... male screw part, 30 ... nut, 31 ... female screw part, 40 ... coil strap, 41 ... ring, 42 ... coil wire, 43 ... NASCAN, 300 ... wristband

Claims (4)

A holding part for holding a bolt or nut;
A hanging portion connected to the holding portion and capable of hanging the holding portion;
The holding part is
A base having a bottomed hole into which a bolt or nut can be inserted in a non-rotatable manner;
A shutter having a through hole into which a bolt or nut can be inserted in a non-rotatable manner;
A rotation mechanism that relatively rotates the shutter and the base body in a state in which the center axes of the bottomed hole and the through hole coincide with each other;
A fall prevention device characterized by comprising: The bottomed hole and the through hole are polygonal,
2. The fall prevention device according to claim 1, wherein the rotating mechanism has a biasing means for biasing toward a phase in which polygonal corners of the bottomed hole and the through hole are shifted. . The rotation mechanism is
A cylindrical portion that is an outer peripheral surface of the bottomed hole of the base;
A sleeve fixed to the shutter;
The fall prevention tool according to claim 1, further comprising a locking portion that holds a state in which the sleeve is rotatably attached to the cylindrical portion.   The fall prevention tool according to claim 1, wherein the hanging part is rotatably connected to the holding part.

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