JP2017214732A - Tool for preventing falling of stepladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent a stepladder with a work floor installed in the side of a loading space of a transporting vehicle from falling in the direction of separating from the loading space.SOLUTION: A tool for preventing falling of stepladder comprises a fitting part 13 that is freely fitted to a side frame 3 of a loading space of a transporting vehicle from upward, and a connection part 14 that is connected with the fitting part 13 and that is connected with a handrail support column 10 of a stepladder with a work floor arranged outside the loading space. The connection part 14 comprises a U-shaped part 15 that is freely fitted to and removed from the handrail support column 10 in the horizontal direction, and a locking tool 16 that is freely switched between a locked state of preventing the handrail support column 10 from escaping and moving in the horizontal direction from the U-shaped part 15 and an unlocked state of allowing escaping and moving.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a stepladder fall prevention tool for preventing a stepladder with a work floor installed on the side of a loading platform of a transporting automobile (truck) from falling in a direction away from the loading platform.

  When transporting materials to or from work sites, stand a stepladder with a work floor on the side of the loading platform of the transport vehicle with the transport vehicle parked at the specified position. An operator who goes up on the work platform of the stepladder may deliver materials to and from the loading platform of the vehicle for transportation. In order to ensure the safety of the worker on the work floor platform, a column for temporarily setting a handrail is attached to the stepladder with the work floor platform used in this way.

  Although related patent documents cannot be disclosed, in the above working environment, the stepladder with the work floor is connected to the loading platform of the vehicle for transportation to prevent the stepladder with the work floor from falling. The equipment for that was not considered. Therefore, when an operator who has moved up on the work platform of the stepladder tries to move onto the platform of the transporting vehicle, the stepladder receives a force in a direction away from the platform of the transporting vehicle. Alternatively, a force that pushes the stepladder away from the loading platform of the transporting vehicle may act when the material gripped by the hand is moved onto the loading platform of the transporting vehicle. As a result, an unexpected situation may occur in which the stepladder falls in a direction away from the loading platform of the transportation vehicle.

  The present invention proposes a stepladder fall prevention tool that can solve the above-mentioned conventional problems, and the stepladder fall prevention tool according to the present invention understands the relationship with the embodiments described later. For the sake of simplicity, when the reference numerals used in the description of the embodiment are shown in parentheses, the mounting fitting that can be fitted from the top to the side frame (3) of the loading platform (2) of the vehicle for transportation is shown. A handrail support column (10) of a stepladder (4) with a work floor placed on the outside of the loading platform (2), which is connected to the fitting portion (13) and the fitting portion for mounting (13). The coupling portion (14) is a U-shaped portion (15) that can be horizontally fitted to and detached from the handrail support column (10), and the U-shaped portion ( 15) and a locking tool (16) that can be switched between a locking state that prevents the handrail support column (10) from escaping in the horizontal direction and a non-locking state that allows the escaping movement. It is made.

  According to the above configuration of the present invention, after a stepladder with a work floor is stood on the side of the loading platform of the transporting vehicle in a state of being stopped at a predetermined position, the side frame of the loading platform of the transporting vehicle, and the work floor The handrail support struts attached to the stepladder can be connected to each other with the stepladder fall prevention tool having the above-described configuration. That is, the fitting part for fitting is fitted to the side frame of the loading platform from above, and the U-shaped part of the coupling part is fitted to the handrail support column in the horizontal direction so that the locking tool is not attached. Switch from the locked state to the locked state. By this work, it is possible to prevent the stepladder with the work floor from moving in the direction away from the platform of the transportation vehicle, and as a result, the stepladder with the work floor from falling away from the platform of the transportation vehicle Disappear. Of course, since a pair of left and right handrail support columns is usually attached to a stepladder with a work floor, each of the pair of left and right handrail support columns is connected to the stepladder of the present invention as described above. By connecting to the side frame of the carrier of the transporting vehicle with the fall prevention tool, the fall prevention effect of the stepladder can be further ensured.

  When carrying out the present invention, specifically, the fitting portion for mounting (13) is an upper end member (17) placed in the transverse direction on the upper end of the side frame (3) of the cargo bed (2). A vertical fixing member (18) fixed to the upper end member (17), and the vertical fixing member (18) attached to the upper end member (17) so as to be movable and fixed in its length direction. A vertically movable member (19) sandwiching the side frame (3) of the loading platform (2) between, the U-shaped portion (15) of the coupling portion (14) is the free end of the upper end member (17) It can be set as the structure attached to the side. According to this structure, since the attachment fitting part fitted to the side frame of the cargo bed from above can be prevented from floating in the length direction of the side frame, safety can be further improved. In addition, when the mounting fitting portion is fitted to the side frame of the loading platform from above, the vertical movable member is separated from the vertical fixed member in a state where the vertical movable member is not fixed to the upper end member. Since the interval between the two can be widened, the mounting operation of the mounting fitting portion can be easily performed.

  The coupling part (14) can be connected to a height adjusting member (20) that can be fixed up and down with respect to the fitting part (13) for attachment. According to this structure, even if the upper end height of the side frame of the loading platform of the transportation vehicle is not constant, the side frame of the loading platform and the handrail support column of the stepladder with the work floor platform are easily and easily connected. I can do it.

FIG. 1 is a rear view of a main part showing a use state. FIG. 2 is a side view of a main part showing a use state. FIG. 3 is a perspective view of a stepladder fall prevention tool. FIG. 4A is a plan view of a stepladder fall prevention tool, FIG. 4B is a partially longitudinal side view of the stepladder fall prevention tool, and FIG. 4C is a front view showing a locking tool of the stepladder fall prevention tool.

  1 and 2, 1 is a stepladder fall prevention tool according to the present invention, 2 is a loading platform in a transportation vehicle, 3 is a side frame erected on both right and left sides of the loading platform 2, and 4 is a work floor. It is a stepladder with a stand. The stepladder 4 with a work floor includes a rectangular work floor 5 in a plan view, a pair of front and rear ladder-type legs 6, and a pair of left and right handrail units 7. The pair of front and rear ladder-type legs 6 have a downwardly extending shape, and are foldably attached to both ends of the work floor base 5 in the length direction on the bottom side of the work floor base 5. A plurality of ladder step members 9 are installed between the pair of left and right side frame members 8 at appropriate intervals in the vertical direction. A lower end portion of a handrail support column 10 for supporting the handrail unit 7 is foldably attached to each side frame member 8 on the lateral side of the upper end. The handrail unit 7 has a portal shape in which a tubular body 12 is fixedly connected in a perpendicular direction downward from both ends in the length direction of a handrail body 11 in a horizontal direction. Before and after the pair of left and right gate-shaped handrail units 7 with each handrail supporting column 10 attached to each of the four corners of the work floor base 5 of the stepladder 4 vertically raised from the four corners of the work floor base 5 The pair of tubular bodies 12 are attached to the left and right sides of the work floor 5 by fitting and fixing to the handrail support columns 10. The stepladder 4 with the work floor is well known in the art.

  The stepladder 4 with the work floor of the above configuration is located outside the side frame 3 on the side where the material delivery work for the load platform 2 is performed, out of the side frames 3 on both the left and right sides of the load platform 2 in the transportation vehicle stopped at a predetermined position. It is installed along the side frame 3. At this time, the work floor 5 of the stepladder 4 with the work floor is located at a height close to the upper end of the side frame 3. The pair of left and right handrail units 7 are attached to the stepladder 4 with the work floor installed as described above, and a pair of front and rear handrail support columns 10 adjacent to the side frame 3 of the load platform 2 and the load platform 2 are attached. The side frame 3 is connected to the stepladder fall prevention tool 1.

  As shown in FIGS. 3 and 4, the stepped-on collapse prevention tool 1 includes an attachment fitting portion 13 that can be fitted to the side frame 3 of the loading platform 2 of the transport vehicle from above, and the attachment fitting portion 13. And a connecting portion 14 to the handrail supporting column 10 of the stepladder 4 with the work floor platform, and the connecting portion 14 can be horizontally fitted to and detached from the handrail supporting column 10. The U-shaped portion 15 and a latching state that prevents the handrail support column 10 from escaping and moving horizontally from the U-shaped portion 15 and a non-locking state that allows the escaping movement. It consists of a stop 16. The fitting portion 13 for attachment is fixed to the upper end member 17 placed in the transverse direction on the upper end of the side frame 3 of the loading platform 2 and fixed to the upper end member 17 so as to be inside the side frame 3 of the loading platform 2. A vertical fixing member 18 that hangs down, and a vertical movable member 19 that is attached to the upper end member 17 so as to be movable and fixed in the length direction and hang down to the outside of the side frame 3 of the loading platform 2. A height adjustment member 20 that can be fixed up and down is attached to the free end portion of the upper end member 17 of the fitting portion 13 for attachment, and the U-shaped portion 15 of the coupling portion 14 is attached to the upper end of the height adjustment member 20. Is provided.

  More specifically, the upper end member 17, the vertical fixing member 18, and the vertical movable member 19 of the fitting portion 13 for attachment are rectangular tube-shaped with the same cross section, and the vertical movable member 19 Both leg plate portions of a gate-shaped member 19a that is externally fitted to the upper-end member 17 are fixed to the upper end of the upper end member 17, and a vertical penetrating screw constituted by a nut 19b fixed to the center of the upper plate of the gate-shaped member 19a. A fastening screw 19c is screwed through the hole. Therefore, by loosening the fastening screw 19c, the vertical movable member 19 can move laterally in the length direction of the upper end member 17, and by fastening the fastening screw 19c, the vertical movable member 19 is fixed to the upper end member 17. I can do it. The height adjusting member 20 is formed by providing long holes 20a along the length direction on both side plate portions of a bar-shaped member having a gate-shaped cross section, and the free end portion of the upper end member 17 of the fitting portion 13 for mounting. The fastening bolt nut 20b is horizontally penetrated across both the long holes 20a and the upper end member 17. Therefore, when the height adjusting member 20 is moved up and down with respect to the upper end member 17, the height adjusting member with respect to the upper end member 17 is loosened by tightening the fastening bolt nut 20b. 20 can be fixed.

  The U-shaped portion 15 of the coupling portion 14 has an upper end portion of the height adjusting member 20 and both left and right sides extending from the upper end portion of the height adjusting member 20 to the side opposite to the side where the mounting fitting portion 13 is located. The left and right side plate portions 15a are integrally connected to the upper end portion of the height adjusting member 20 from the top of the gate-shaped member 15b, and the portal-shaped member 15b. The left and right side plate portions 15a and the upper end portion of the height adjusting member 20 are connected and fixed by a connecting bolt nut 15c that penetrates horizontally through the upper end portion of the height adjusting member 20. The locking tool 16 has an L shape in which a drooping pin portion 16a is bent downward from the rear end of a pin that horizontally penetrates the vicinity of the front ends of the left and right side plate portions 15a constituting the U-shaped portion 15 of the coupling portion 14. It consists of a pin, and is provided at its tip with a bifurcated portion 16d that pivotally supports a retaining plate 16c so as to be swingable around a horizontal support shaft 16b. In order to prevent the locking tool 16 from being lost, the ring 16e attached to the lower end of the hanging pin portion 16a of the locking tool 16 and a portion of the coupling bolt nut 15c that crosses the height adjusting member 20 The ring 16f loosely fitted in (shown in phantom lines in FIG. 4B) can be connected by means of a chain or the like.

  The method of using the stepped-up fall prevention tool 1 having the above-described configuration will be described. As shown in FIGS. 1 and 2, the transportation vehicle is stopped at a predetermined position, and the work floor is located in the left and right side frames 3 of the loading platform 2. The fitting fitting portions 13 for attaching the two stepladder collapse prevention tools 1 are externally fitted from the top to the upper end of the side frame 3 on the side on which the stepladder with stand 4 is installed. Of course, at this time, the fastening screw 19c is loosened so that the vertical movable member 19 is moved away from the vertical fixing member 18 so that the stepped-down device 1 can be moved in the length direction of the side frame 3. . Next, the stepladder 4 with a work floor to which the handrail unit 7 is attached is installed so as to be adjacent to the side frame 3. At this time, the stepladder collapse prevention tool 1 is arranged in the length direction of the side frame 3. 2 of the connecting portion 14 adjacent to the side frame 3 of the stepped-down device 1 in the U-shaped portion 15 that is released outwardly with the locking tool 16 removed. The handrail support columns 10 are respectively fitted. In addition, after installing the stepladder 4 with a work floor so that the two handrail support columns 10 supporting the handrail unit 7 on one side are adjacent to the side frame 3 on one side of the loading platform 2, The U-shaped portion 15 of the coupling portion 14 of the stepladder fall prevention tool 1 is externally fitted to the handrail support column 10, and the stepped stand fall prevention tool 1 is lowered so that the fitting portion 13 is attached to the side of the loading platform 2. The upper end of the frame 3 may be fitted.

  Next, the vertical movable member 19 in the fitting fitting portion 13 of each leg stand-up prevention tool 1 is laterally moved along the upper end member 17 so that the side frame 3 approaches the vertical fixing member 18. In a state of being sandwiched between the vertical movable member 19, the fastening screw 19 c at the upper end of the vertical movable member 19 is screwed to fix the vertical movable member 19 to the upper end member 17. And between the front-end | tip parts of the U-shaped part 15 in the coupling | bond part 14 of each stepladder fall-down prevention tool 1 externally fitted to the handrail support support | pillar 10 of the stepladder 4 with a work floor stand is obstruct | occluded with the locking tool 16. FIG. Specifically, in a state where the retaining plate 16c of the locking tool 16 is extended from the tip of the locking tool 16, and the hanging pin portion 16a faces downward, the locking tool 16 is placed on both the left and right sides. It inserts between the front-end | tip parts of the board part 15a. When the retaining plate 16c of the locking tool 16 reaches the outside of the left and right side plate portions 15a, the retaining plate 16c is turned downward by gravity. As a result, the retaining plate 16c maintains a retaining posture in which the retaining member 16 protrudes in the upper and lower sides with respect to the locking tool 16, and prevents the locking tool 16 from falling off the left and right side plate portions 15a together with the hanging pin portion 16a. To do. Depending on the height of the side frame 3, the height of the U-shaped portion 15 in the connecting portion 14 of the stepladder collapse prevention tool 1 may be unreasonable with respect to the handrail support column 10 of the installed stepladder 4 with a work floor. There is also a possibility that the height may be deviated from within the allowable range in the height direction. In such a case, the position of the height adjustment member 20 is adjusted in the vertical direction with respect to the upper end member 17 in the fitting portion 13 for attachment, and the height of the U-shaped portion 15 is adjusted so as to fall within the allowable range. Just keep it.

  As described above, by connecting the handrail support column 10 of the stepladder 4 with the work floor and the side frame 3 of the loading platform 2 in the transportation vehicle by the stepladder collapse prevention tool 1, the work floor is attached. Since it is possible to reliably prevent the stepladder 4 from falling in a direction away from the side frame 3, it is possible to ensure the safety of the worker who works on the work floor 5 of the stepladder 4 with the work floor.

  In addition, the fitting part 13 for attachment arrange | positions the perpendicular | vertical fixing member 18 and the vertical movable member 19 in reverse, and when the fitting part 13 for attachment is fitted and fixed to the side frame 3 of the carrier 2, the said carrier Regardless of the thickness of the second side frame 3, the horizontal distance between the side frame 3 and the U-shaped portion 15 of the coupling portion 14 may be constant. Further, the mounting angle with respect to the mounting fitting portion 13 can be changed by 90 degrees so that the U-shaped portion 15 of the coupling portion 14 is opened in the length direction of the side frame 3 of the loading platform 2. If comprised in this way, the U-shaped part 15 of the coupling | bond part 14 is moved by moving the fitting part 13 for attachment fitted to the side frame 3 of the loading platform 2 to the length direction of the side frame 3, It can be fitted from the side to the handrail support column 10 of the stepladder 4 with a work floor. The locking tool provided on the U-shaped part 15 of the coupling part 14 is not limited to the locking tool 16 formed of an L-shaped pin provided with a retaining plate 16c, but may be another appropriate engagement such as a bolt and nut. It can also be implemented with a fastener.

  The stepladder collapse prevention tool of the present invention includes a stepladder with a work floor installed to be adjacent to a side frame of a loading platform in a transport vehicle for loading and unloading materials, and a side frame of the loading platform. It can be used as a means for connecting using a handrail support column provided in a stepladder with a floor.

DESCRIPTION OF SYMBOLS 1 Stepladder fall prevention tool 2 Car bed in transporting vehicle 3 Side frame of load carrier 4 Stepladder with work floor 5 Work floor 6 Ladder type leg 7 Handrail unit 10 Handrail support column 13 Mounting fitting 14 Joining 15 U-shaped part

Claims (3)

  A fitting part for mounting that can be fitted to the side frame of the carrier bed of the transporting vehicle from above, and a stepladder with a work floor platform that is arranged outside the cargo bed and that is connected to the fitting part for mounting. A coupling portion for a supporting column for sliding support, and this coupling portion includes a U-shaped portion that can be horizontally fitted to and detached from the supporting column for supporting railing, and the handrail supporting column is horizontally connected from the U-shaped portion. A stepped-down prevention tool comprising a locking tool that can be switched between a locking state that prevents the escape movement in a direction and a non-locking state that allows the escape movement.   The mounting fitting portion moves in the longitudinal direction to the upper end member placed in the transverse direction on the upper end of the side frame of the cargo bed, the vertical fixing member fixed to the upper end member, and the upper end member. A vertically movable member that is fixedly attached and sandwiches a side frame of the cargo bed with the vertical fixing member, and the U-shaped portion of the coupling portion is attached to the free end side of the upper end member. The stepladder fall prevention tool according to claim 1.   The stepladder fall prevention tool according to claim 1 or 2, wherein the coupling portion is connected to a height adjusting member that can be fixed up and down with respect to the fitting portion for attachment.

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