JP7462928B2 - Lifeline erection support for freight cars - Google Patents

Description

The present invention relates to a support pole for installing a lifeline to prevent people from falling onto the bed of a freight vehicle.

A support pole for erecting a safety rope to which a worker's safety belt is attached to prevent them from falling when the worker loads or unloads cargo on the bed of a truck or other freight vehicle is connected, has a support pole support part provided at the lower end of the main body of the support pole, and is configured to be erected on the bed by connecting the support pole support part to the upper edge of the side wall plate of the bed, the so-called gate plate (for example, Patent Documents 1 to 4).

The main rope erection pillars of Patent Documents 1 to 3 have a generally C-shaped pillar support part that opens downward at the lower end of the pillar body, and are configured so that the pillar support part is engaged with the upper edge part of the gate plate from above and a fixing member (bolt) provided on the side part of the pillar support part is pressed against the side part of the gate plate, thereby connecting the pillar support part to the upper edge part of the gate plate.
The main rope erection pillar of Patent Document 4 has a generally C-shaped pillar support portion that opens downward at the lower end of the pillar body, and is configured so that the pillar support portion is engaged with the upper edge portion of the gate plate from above and the spacing between both side plate portions (first member and second member) is adjusted to connect the pillar support portion to the upper edge portion of the gate plate.

JP 2009-61192 A JP 2016-36507 A JP 2018-78932 A JP 2015-39527 A

However, in the life rope erection pillars in Patent Documents 1 to 4, the pillar support parts are only connected by the pressing friction force of the fixing member and side plate parts against the gate plate. Therefore, when the life rope is pulled during work and a load is applied to the pillar body in the vertical or circumferential direction, there is a risk that the pillar body will shift or tilt upward, making it impossible to hold the life rope with the appropriate tension.

The main rope erection pillar in Patent Document 2 is equipped with a pulling device that can pull the pillar support part toward the gate plate by engaging one end with the side plate of the pillar support part and the other end with the lower end surface of the gate plate, and is said to be able to prevent the pillar support part from coming off the gate plate even if an upward force is generated on the pillar support part. However, since this device only hooks the hook part on one end of the pulling device onto the lower end surface of the gate plate, there is a problem that the hook part may slip or come off the lower end surface of the gate plate depending on the direction and magnitude of the load applied to the pillar body, making it impossible to reliably prevent the pillar body from slipping or tilting.

The present invention was made in consideration of the above problems, and aims to provide a lifeline erection support for freight vehicles that has high installation stability and allows the lifeline to be stably erected on the loading platform.

In order to solve the above problems, the life rope erection support of the present invention employs the following technical measures.
In other words, the life rope erection pillar of the present invention is a life rope erection pillar for erecting a life rope to prevent workers from falling onto the loading platform of a truck, and comprises a pillar main body having a rope hanging portion capable of hooking and holding the life rope, and a pillar support portion for connecting and supporting the pillar main body in an upright position to the side wall panel of the loading platform, the pillar support portion having an upper hooking portion capable of hooking onto the upper edge of the side wall panel and a lower hooking portion capable of hooking onto the lower edge of the side wall panel, and is configured to be connectable by clamping the side wall panel from above and below with the upper hooking portion and the lower hooking portion , the lower hooking portion having a lower hooking portion main body that is arranged to be movable up and down along the pillar main body, an adjusting nut that supports the lower hooking portion main body from below, and a guide bolt that supports the adjusting nut so that it can be moved up and down, and is configured so that the vertical separation distance from the upper hooking portion can be adjusted by moving the adjusting nut up and down .

With one of the short sides of the pillar body being the front-to-rear direction, the upper hook portion and the lower hook portion are each configured to be movable in the front-to-rear direction, and have a pressing portion that can be pressed from the front-to-rear direction against the side portion of the side wall panel opposite the pillar body, and the lower hook portion may have, as the pressing portion, a pair of lower pressure plates that are provided at left and right lateral positions across the pillar body and each abut and engage against the side portion when the pillar support portion is connected to the side wall panel.

The main rope installation pillar of the present invention can connect and fix the pillar support part to the side wall plate (gate plate) of the loading platform by clamping it from above and below, so even if a load is applied to the rope hook part from the vertical or circumferential direction, the pillar body is unlikely to shift upward or tilt. This significantly improves the installation stability.

A figure showing an example of the use state of the life rope erection support of the embodiment. FIG. 2 is a front oblique view of the life rope installation post of the embodiment. FIG. 2 is a rear perspective view of the life rope installation post of the embodiment. FIG. 2 is a front view of the life rope erection support pole of the embodiment. FIG. 2 is a rear view of the life rope installation support pole of the embodiment. FIG. 2 is a left side view of the life rope installation support pole of the embodiment. FIG. 2 is a right side view of the life rope installation support pole of the embodiment. FIG. 2 is an enlarged plan view of a life rope installation post of an embodiment. FIG. 2 is an enlarged bottom view of the life rope installation pole of the embodiment. FIG. FIG.

Hereinafter, an embodiment of the life rope erection pole of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the configuration of the present invention is not limited to this specific example.
As shown in Figure 1, the lifeline erection support 1 of this embodiment is a support for erecting a lifeline S to prevent workers from falling onto the bed of a freight vehicle such as a truck, and is used by installing multiple support lines side by side on the side wall panel (hereinafter referred to as the "gate panel") P of the bed.

Although Figure 1 shows two life rope erection posts 1 erected at a specified distance apart in the longitudinal direction of the gate plate P (front-to-back direction of the loading platform), with the life rope S stretched horizontally between these life rope erection posts 1, it is also possible to erect three or more life rope erection posts 1 at specified intervals in the longitudinal direction of the gate plate P, with the life rope S stretched horizontally between each of these life rope erection posts 1. Also, while Figure 1 shows the life rope erection post 1 erected on the gate plate P on the right side of the loading platform, the life rope erection post 1 can also be erected on the gate plate P on the rear side of the loading platform.

As shown in Figures 2 to 9, the main rope erection pillar 1 comprises a pillar body 10 having a rope hanging portion 12 capable of hanging and holding the main rope S, and a pillar support portion 11 for connecting and supporting the main pole body 10 in an upright position to the gate plate P.
In the following explanation, the up-down direction in the front view of Figure 4 is the up-down direction of the main rope erection post 1, the left-right direction in the front view is the left-right direction of the main rope erection post 1, and the direction perpendicular to the front view is the front-to-back direction of the main rope erection post 1.

The pillar body 10 is a hollow block having a generally rectangular cross section that is long in the vertical direction, and has a rope hook 12 at its upper end. The pillar support 11 is provided near the lower end of the outer periphery of the pillar body 10. In addition, a reinforcing plate 13 is provided on the outer periphery of the pillar body 10 to reinforce the periphery of the connection of an upper hook 14, which will be described later.
The rope hooking part 12 is configured by arranging two hook parts 120, 120, which are generally inverted L-shaped when viewed from the side, facing each other with a specified gap in the front and rear, and the life rope S is inserted into the gap on the inside between these hook parts 120, 120. This holds the life rope S against the rope hooking part 12 so that it does not easily come off upward or in the front-rear direction.

The reinforcing plate 13 is formed by bending a vertically long rectangular plate in a generally U-shape in the short direction, with its front plate 131 facing the front part 101 of the pillar body 10 (hereinafter referred to as the "pillar front part") in a flush state, and the left and right side end plates 133, 134 are fixed in a flush state to the left and right side parts 103, 104 of the pillar body 10, respectively. Note that in this embodiment, the side end plates 133, 134 of the reinforcing plate 13 are fixed to the side parts 103, 104 of the pillar body 10 by riveting, but they may also be fixed by screws, welding, or the like.

In this way, by providing a reinforcing plate 13 around the connection portion of the upper hook 14 on the outer periphery of the pillar main body 10 to create a double-wall structure, the bending rigidity around the connection portion is increased, so that even if the main rope S is pulled and a load of a predetermined amount or more is applied to the upper end of the pillar main body 10 in the forward/backward or left/right directions, the area around the connection portion is less likely to undergo plastic deformation.
As shown in Figures 2 to 11, the pillar support portion 11 is provided at a fixed position below the center between the top and bottom on the outer periphery of the pillar main body 10, and is equipped with an upper hook 14 as an upper engaging portion that can be engaged from above with the upper edge portion P1 of the gate plate P, and a lower hook 15 as a lower engaging portion that is provided at a position below the arrangement portion of the upper hook 14 on the outer periphery of the pillar main body 10 and can be engaged from below with the lower edge portion P2 of the gate plate P. By clamping the gate plate P from above and below with these upper hooks 14 and lower hooks 15, the pillar main body 10 is configured to be connected and supported in an upright state to the gate plate P.

In addition, the rear portion 102 of the pillar main body 10 (hereinafter referred to as the ``pillar rear portion'') is provided with a rib-shaped protrusion (hereinafter referred to as the ``bead'') 16 that abuts against the front portion (side portion on the pillar main body 10 side) P3 of the tilt plate P and suppresses the pillar main body 10 from shifting relative to the tilt plate P.
The bead 16 is a long, narrow, strip-shaped plate made of a resin material such as polyvinyl chloride, polypropylene, or natural rubber, and extends along the rear surface 102 of the support pillar from the connection position of the upper hook 14 to the lower end of the support pillar body 10. Therefore, when the support pillar support part 11 is connected to the gate plate P, the bead 16 is brought into contact with the front surface P3 of the gate plate P in an up-down strip shape. Therefore, even if a load is applied to the upper end of the support pillar body 10 in the left-right or up-down directions, the support pillar body 10 is unlikely to shift upward or left-right from the front surface P3 of the gate plate P.

The upper hook 14 is provided with an upper support shaft 21 that is provided in a state where it protrudes rearward from the rear surface portion 102 of the support, an upper pressing plate 22 that is provided at the rear end portion of the upper support shaft 21 and serves as a pressing portion that can be pressed against the upper edge portion P1 of the gate plate P from above and behind, and a rotation prevention piece 23 that is provided in a state where it protrudes forward from the upper pressing plate 22 and can abut against the side portion of the support body 10 (here, the right end plate 133 of the reinforcing plate 13).

The upper support shaft 21 is formed by bending a single, generally cylindrical shaft into a generally L-shape, and the front extension 21A extending forward from the bent portion is inserted from the front to rear direction into the shaft insertion holes 41 provided in the front column portion 101, the rear column portion 102, and the front plate 131 of the reinforcing plate 13. In other words, the front extension 21A of the upper support shaft 21 is connected and supported in a state in which it can move forward and backward relative to the support body 10, and extends to the rear of the support body 10. Meanwhile, the lower extension 21B extending downward from the bent portion is disposed approximately parallel to the support body 10 at a position rearward of the rear column portion 102.

A screw thread is formed on the outer peripheral surface of the front extension 21A, and a wing nut (hereinafter referred to as the "upper tightening nut") 17 is screwed into the front end of the front extension 21A from the front side of the pillar front surface 101. This holds the upper support shaft 21 in a non-removable state relative to the pillar body 10. Furthermore, by rotating the upper tightening nut 17 in the circumferential direction, the upper support shaft 21 moves forward and backward. As a result, the distance between the lower extension 21B and the pillar rear surface 102 in the forward and backward directions is adjusted.

The upper pressing plate 22 is formed by bending a horizontally elongated, substantially rectangular plate body in the short direction into a substantially L-shape, and is connected and fixed to the inner corner of the bent portion of the upper support shaft 21. That is, the upper pressing plate 22 has an upper plate portion 22A extending forward from the bent portion and provided along the front extension portion 21A of the upper support shaft 21, and a rear plate portion 22B extending downward from the bent portion and provided along the lower extension portion 21B of the upper support shaft 21. Therefore, when the pillar support portion 11 is connected to the gate plate P, the upper plate portion 22A of the upper pressing plate 22 comes into surface contact with the upper surface of the upper edge portion P1 of the gate plate P, and the rear plate portion 22B comes into surface contact with the rear surface of the upper edge portion P1 of the gate plate P (the side surface portion P4 on the opposite side to the pillar main body 10).

The width dimension between the left and right of the upper pressure plate 22 is set to be larger than the width dimension between the left and right of the pillar body 10, and when the pillar support part 11 is connected to the gate plate P, the upper pressure plate 22 is pressed against the upper surface and rear surface of the upper edge part P1 of the gate plate P over a wide range from the rear opposing position of the pillar rear part 102 to the left and right outside. Therefore, even if a load is applied to the upper end of the pillar body 10 in the front-rear or left-right directions, the pillar body 10 is unlikely to tilt left or right or rotate circumferentially.

The anti-rotation piece 23 is formed from a single, generally rectangular column-shaped shaft, the rear end of which is supported and fixed to the upper surface of the upper plate portion 22A of the upper pressing plate 22, and extends along the right end plate 133 of the reinforcing plate 13, generally parallel to the forward extension portion 21A of the upper support shaft 21. Therefore, even if rotational stress is applied to the upper support shaft 21 in the circumferential direction of the forward extension portion 21A, the anti-rotation piece 23 abuts against the right end plate 133 of the reinforcing plate 13, preventing the upper support shaft 21 from rotating.

The lower hook 15 includes a lower hook body 24 that is ring-shaped around the outer periphery of the support body 10, an adjustment nut 25 that moves the lower hook body 24 up and down, a guide bolt 26 that supports the adjustment nut 25 so that it can move up and down, a lower support shaft 27 that protrudes from the rear of the lower hook body 24, an insert nut 28 that supports the lower support shaft 27 so that it can move back and forth, and a lower pressing plate 29 that is attached to the rear end of the lower support shaft 27 and serves as a pressing part that can be pressed against the lower edge P2 of the gate plate P from behind.

The guide bolt 26 is a single, approximately cylindrical shaft that extends vertically along the pillar front surface 101 between a pair of brackets 18, 18 that are vertically spaced apart from each other on the pillar front surface 101.
A screw thread is formed on the outer circumferential surface of the guide bolt 26, and the adjusting nut 25 is screwed to the outer circumferential portion of the screw thread. Therefore, when the adjusting nut 25 is rotated in the circumferential direction, the adjusting nut 25 moves up and down along the guide bolt 26.

As shown in Figures 8 to 11, the lower hook body 24 is a block body formed in a generally T-shape when viewed from above, and a support insertion hole 50 that is generally rectangular when viewed from above is formed in the center between the left and right sides from the upper end to the lower end of the lower hook body 24. The support body 10 is loosely inserted into the support insertion hole 50 in a state where it is prevented from rotating and is movable up and down. In other words, the lower hook body 24 is configured to be able to slide up and down along the support body 10 while being kept in a fixed orientation. In addition, the lower hook body 24 is supported from above by the adjustment nut 25. Therefore, if the adjustment nut 25 is rotated in the circumferential direction and moved up and down along the guide bolt 26, the lower hook body 24 also moves up and down along the support body 10 in conjunction with it. This adjusts the vertical separation distance between the lower hook 15 and the upper hook 14.

A notch 51 that communicates with the inner space of the pillar insertion hole 50 is formed in the center between the left and right sides of the rear surface 242 of the lower hook body 24. The notch 51 extends from the upper end to the lower end of the lower hook body 24, allowing the bead 16 of the pillar body 10 inserted into the pillar insertion hole 50 to face the rear of the lower hook body 24.
A guide groove 52 having a generally U-shape when viewed from above is formed in the center of the front end of the lower hook body 24, through which the guide bolt 26 is inserted. The guide groove 52 extends from the upper end to the lower end of the lower hook body 24, and the guide bolt 26 is loosely inserted along the inside of the guide groove 52. The adjusting nut 25 abuts against the peripheral portion of the lower end of the guide groove 52 from below.

The lower hook body 24 has a protruding portion 240 on the left and right outside of the support insertion hole 50. The protruding portion 240 is formed to protrude outward from the left and right side portions 103, 104 of the support body 10. The protruding portion 240 has a nut storage groove 52 that is roughly U-shaped when viewed from above and opens to the rear surface portion 242 of the lower hook body 24, and the insert nut 28 is embedded and held in the inner bottom portion in a non-removable state. In addition, the front surface portion 241 of the protruding portion 240 has a shaft insertion hole 42 that communicates with the nut storage groove 52.

The lower support shaft 27 is a single, generally cylindrical shaft body that is inserted through the shaft insertion hole 42 of the overhanging portion 240 from the front-rear direction and extends to the rear of the overhanging portion 240 through the nut accommodating groove 52. That is, the lower support shaft 27 is connected and supported in a state in which it can move forward and backward relative to the overhanging portion 240, and extends to the rear of the overhanging portion 240. A screw thread is formed on the outer periphery of the lower support shaft 27, and the lower support shaft 27 is screwed and connected to the insert nut 28 that is accommodated and held in the nut accommodating groove 52.

A wing nut (hereinafter referred to as the "lower tightening nut") 19 is connected and fixed to the front end of the lower support shaft 27. Meanwhile, a lower pressing plate 29 is connected and supported to the rear end of the lower support shaft 27. Therefore, when the lower tightening nut 19 is rotated, the lower support shaft 27 moves in the front-rear direction. As a result, the front-rear distance between the lower pressing plate 29 and the rear surface 242 of the lower hook body 24 is adjusted.

As described above, the lower support shafts 27 are arranged side by side on the left and right sides of the support body 10, and when the support support part 11 is connected to the gate plate P, the lower support shafts 27 are engaged with the lower surface of the lower edge part P2 of the gate plate P on the left and right outer sides of the support body 10. Also, each lower support shaft 27 is engaged with the lower surface of the lower edge part P2 of the gate plate P in a direction perpendicular to its longitudinal direction (left and right direction). Furthermore, the lower pressing plate 29 connected to the rear end of the lower support shaft 27 is pressed against the rear surface of the lower edge part P2 of the gate plate P further outward to the left and right than the rear facing position of the rear surface part 102 of the support. Therefore, even if a load is applied to the upper end of the support body 10 in the front-rear or left-right direction, the support body 10 is unlikely to tilt left and right or rotate in the circumferential direction.

As described above, the pillar support part 11 is configured to clamp the gate plate P from above and below with one upper support shaft 21 provided in the center between the left and right sides of the pillar body 10, and two lower support shafts 27 provided side by side at the left and right sides of the pillar body 10. In other words, the pillar support part 11 is supported by engaging with the gate plate P at three points, one above and two below. Therefore, the pillar body 10 is less likely to tilt left or right.

The lower pressure plate 29 is a plate body having a substantially square shape when viewed from the front, and is connected and fixed to the rear end of the lower support shaft 27. Therefore, when the pillar support part 11 is connected to the gate plate P, the lower pressure plate 29 comes into surface contact with the rear surface of the lower edge part P2 of the gate plate P. The lower pressure plate 29 may be formed into a substantially triangular shape when viewed from the front, a substantially polygonal shape having five or more sides when viewed from the front, or a substantially circular shape when viewed from the front, as long as it can secure a sufficient contact area with the lower edge part P2 of the gate plate P. In addition, the lower pressure plate 29 may be connected and supported to the rear end of the lower support shaft 27 so as to be rotatable in the circumferential direction, as long as it can be reliably pressed against the lower edge part P2 of the gate plate P.

The procedure for connecting the main rope erection pillar 1 to the gate plate P will be explained. First, with the pillar body 10 in an upright position on the front part P3 side of the gate plate P, the upper hook 14 of the pillar support part 11 is engaged from above with the upper edge part P1 of the gate plate P. Specifically, the upper pressing plate 22 of the upper hook 14 is hooked along the rear corner part of the upper edge part P1 of the gate plate P. As a result, the pillar body 10 is supported in an upright state on the gate plate P.

In this state, the upper tightening nut 17 screwed onto the upper support shaft 21 of the upper hook 14 is rotated in one direction (clockwise) to tighten it. This reduces the front-to-rear separation distance between the upper pressing plate 22 (lower extension 21B of the upper support shaft 21) and the rear surface 102 of the support column, and the upper pressing plate 22 is pressed against the rear surface P4 of the gate plate P from behind, while the bead 16 of the rear surface 102 of the support column is pressed against the front surface P3 of the gate plate P. In other words, the upper edge P1 of the gate plate P is clamped from the front-to-rear direction between the upper pressing plate 22 and the support column main body 10. As a result, the support column main body 10 is held in a state where it is prevented from moving forward, backward, left, right, and up and down relative to the gate plate P.

Next, the adjustment nut 25 screwed into the guide bolt 26 on the front part 101 of the support is rotated in one direction (clockwise) and moved upward along the guide bolt 26. As a result, the lower hook body 24 attached to the support body 10 is pushed upward by the adjustment nut 25, and the two lower support shafts 27 extended from the rear of the lower hook body 24 are each engaged with the lower edge P2 of the gate plate P from below. In other words, the gate plate P is sandwiched between the lower support shaft 27 of the lower hook 15 and the upper pressing plate 22 of the upper hook 14 from above and below. As a result, the vertical movement of the support body 10 relative to the gate plate P is more firmly prevented.

In this state, the lower tightening nuts 19 provided at the front end of each lower support shaft 27 are rotated in one direction (clockwise) to tighten. This reduces the front-to-rear separation distance between the lower presser plate 29 provided at the rear end of each lower support shaft 27 and the lower hook body 24, and the lower presser plate 29 is pressed against the rear surface P4 of the gate plate P from behind, while the bead 16 on the rear surface 102 of the pillar is pressed against the front surface P3 of the gate plate P. In other words, the lower edge P2 of the gate plate P is clamped from the front-to-rear direction between the two lower presser plates 29 and the pillar body 10. As a result, movement of the pillar body 10 relative to the gate plate P in the front-to-rear, left-to-right, and up-to-down directions is more firmly prevented.

In this way, with the above-mentioned lifeline erection pillar 1, the pillar support part 11 can be connected and fixed by clamping it from above and below to the gate plate P. Therefore, even if the lifeline S is pulled during work and loads are applied to the rope hanging part 12 from the vertical and circumferential directions, the pillar body 11 is unlikely to shift upward or tilt, and installation stability is high. Therefore, the lifeline S can be stably erected on the loading platform.

In addition, the upper hook 14 is provided at a fixed position between the top and bottom of the pillar body 10, and the lower hook 15 is provided at a position below the upper hook 14 on the pillar body 10 so that it can be moved up and down. This makes it possible to attach the pillar body 10 to the gate plate P in advance by engaging the pillar support part 11 with the upper edge part P1 of the gate plate P, making the installation easy.

Furthermore, in this device, the upper pressure plate 22 of the upper hook 14 and the lower pressure plate 29 of the lower hook 15 are each configured to be movable in the front-to-rear direction of the support body 10, and the gate plate P can be connected and fixed by clamping it from the front and rear between the pressure plates 22, 29 and the support body 10, so that the shifting and tilting of the support body 11 can be more reliably prevented. Therefore, the life rope S can be more stably erected on the loading platform.

Reference Signs List 1: life rope erection pillar 10: pillar body 11: pillar support part 12: rope hook part 14: upper hook (upper hook joint part)
15 Lower hook (lower joint)
22 Upper pressing plate (pressing part)
29 Lower pressing plate (pressing part)
P Gate board (side wall board)
P1 Upper edge P2 Lower edge S Life rope

Claims (2)

A lifeline erection support for erecting a lifeline to prevent workers from falling onto the bed of a freight vehicle,
A support body having a rope hook portion capable of hooking and holding the life rope;
a support portion for connecting and supporting the support body to the side wall plate of the loading platform in an upright state,
The column support portion has an upper engaging portion that can be engaged with an upper edge portion of the side wall plate and a lower engaging portion that can be engaged with a lower edge portion of the side wall plate, and is configured to be connectable by sandwiching the side wall plate from above and below with the upper engaging portion and the lower engaging portion,
The lower hanging portion has a lower hanging portion main body that is arranged to be able to move up and down along the pillar main body, an adjustment nut that supports the lower hanging portion main body from below, and a guide bolt that supports the adjustment nut so that it can move up and down, and is a main rope erection pillar that is configured so that the vertical distance from the upper hanging portion can be adjusted by moving the adjustment nut up and down. One of the short sides of the support body is set as the front-rear direction,
The upper engaging portion and the lower engaging portion are each configured to be movable in a front-rear direction and have a pressing portion that can be pressed against a side surface of the side wall plate opposite to the support body in the front-rear direction,
The main rope erection column described in claim 1, wherein the lower engagement portion has a pair of lower pressure plates that are provided at left and right lateral positions on either side of the column body as the pressing portion, and that abut and engage with the side portion when the column support portion is connected to the side wall panel.

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