JP2021195221A - Load fall prevention device and fork lift equipped with the same - Google Patents

Abstract

To provide a load fall prevention device that is able to prevent fall of a load by securely preventing lateral swing of the load through a simple configuration and at a low cost.SOLUTION: A load fall prevention device 1 is mounted on a fork lift 100 that includes a vehicle portion 50, a lifting/lowering guide portion 60 provided at a front of the vehicle portion 50, and a lifting/lowering portion 70 configured to move upward and downward along the lifting/lowering guide portion 60 and that supports a load by a pair of forks 71, left and right, of the lifting/lowering portion 70 from below. The load fall prevention device is attached to the lifting/lowering portion 70 of the fork lift 100 so as to be detachable and is configured in a U-shape in a plan view by including a base portion 2 horizontally extending in a width direction and a pair of guard portions 3, left and right, horizontally extending forwards from both left and right ends of the base portion 2 and also extending parallel to each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a load drop prevention device for preventing a load that is carried on an elevating part of a forklift from falling, and a forklift including the device.

Generally, a forklift is provided with a self-propelled vehicle portion, an elevating guide portion provided in front of the vehicle portion, and an elevating portion that moves up and down along the elevating guide portion, and is loaded by a pair of left and right forks of the elevating portion. Is supported from below and transported.

By the way, in such a forklift, when the height of the load supported and conveyed by the fork exceeds a predetermined value, the load collapses (collapses) and falls from the fork. There is a risk. In addition, even if the forklift sways while traveling, the sway may be transmitted to the load, resulting in instability.

As a conventional technique for dealing with such a drop of a load, for example, Patent Document 1 describes whether or not the height of the load before transportation is a height that can be transported without causing the load to collapse. Forklifts equipped with a safety device that can be identified have been proposed. Specifically, the safety device provided in this forklift is a proximity sensor that detects the lift of the fork of the forklift, and an ultrasonic wave that detects the height of the load lifted by the lift fork detected by the proximity sensor. It includes a sensor and a control device for determining whether or not the height of the load detected by the ultrasonic sensor is lower than a predetermined upper limit value set in advance.

Japanese Unexamined Patent Publication No. 2008-156093

However, the forklift safety device proposed in Patent Document 1 has a problem that the system configuration is complicated and the cost increases because it is equipped with various sensors such as proximity sensors and ultrasonic sensors as well as a control device. .. In addition, even if the height of the load is determined by such a safety device to be a safe height that does not collapse, the load will be loaded when the forklift climbs over a step or travels on a ramp. It may fall in the left-right direction and become unstable or fall.

The present invention has been made in view of the above problems, and an object thereof is a load fall prevention device capable of preventing the load from rolling and falling effectively with a simple configuration at low cost and reliably. Is to provide a forklift equipped with.

In order to achieve the above object, the present invention moves up and down along the vehicle portion (50), the elevating guide portion (60) provided in front of the vehicle portion (50), and the elevating guide portion (60). It is a load drop prevention device (1) provided with an elevating part (70) and attached to a forklift (100) that supports the load from below by a pair of left and right forks (71) of the elevating part (70) and conveys the load. The base portion (2), which is detachably attached to the elevating portion (70) of the forklift (100) and extends in the width direction, extends parallel to each other from the left and right ends of the base portion (2) toward the front. It is characterized by including a pair of left and right guard portions (3).

According to the present invention, even when the load supported by the pair of left and right forks of the elevating part of the forklift is tilted to the left and right during transportation, the left and right tilt of the load is the left and right guards of the load fall prevention device. Since the load is regulated by contacting one of the portions, it is possible to reliably prevent the load supported by the fork from becoming unstable or falling from the fork. Further, such an effect can be obtained by a simple configuration in which a load drop prevention device having a relatively simple structure is attached to the elevating part of the forklift without requiring various sensors or control devices.

Further, in the load drop prevention device (1), at least one of the base portions (2) is detachably attached to the elevating portion (70) of the forklift (100) by a clamp jig (7). There may be.

According to the above configuration, the load drop prevention device can be easily attached to the elevating part of the forklift with one touch, or can be easily removed from the elevating part, if necessary. Since the attachment / detachment of such a load drop prevention device is easily performed regardless of the model of the forklift, its versatility is enhanced.

Further, the forklift (100) of the load drop prevention device (1) is prevented from coming off from the elevating part (70) at both left and right ends of the base portion (2) of the load fall prevention device (1). The tool (8) may be attached respectively.

According to the above configuration, when at least one part of the base portion of the load fall prevention device is attached to the elevating part of the forklift, even if the load drop prevention device is tilted to the left or right with respect to the attachment point, the same. Since the tilt is regulated by a pair of left and right anti-disengagement fittings, it is possible to reliably prevent the occurrence of a problem that the load fall prevention device disengages from the elevating part of the forklift and falls off.

Further, in the load drop prevention device (1), a plate (5) serving as a mark may be suspended and supported by the pair of left and right guard portions (3).

According to the above configuration, even when the pair of left and right guard portions of the load fall prevention device are located at a height close to the worker's face, the presence of the guard portions is visually recognized by the operator by the marker plate, so that the work can be performed. It is possible to ensure the high safety of the person.

Further, in the load drop prevention device (1), the width dimension (W) between the pair of left and right guard portions (3) is set to a dimension slightly larger than the width of the load, and each guard portion (1). The inner surface of the tip portion of 3) may be a tapered surface (3a) that is inclined outward in the width direction toward the tip.

According to the above configuration, when a pair of left and right forks of a forklift is inserted into the space below the load and the load is loaded on the fork, the left and right sides of the load are formed on the inner surfaces of the pair of left and right guard portions of the load drop prevention device. Since it is guided by the tapered surface, the loading operation of the load on the fork can be performed smoothly and quickly.

Further, the load drop prevention device (1) is divided into two parts on the left and right, and at least one of the divided pieces (1L, 1R) is the elevating part (1L, 1R) of the forklift (100) by the clamp jig (7). It may be attached to each of 70) so as to be detachable.

According to the above configuration, since each of the two divided pieces of the load fall prevention device is lightweight (about 1/2 the weight of the integrated load fall prevention mechanism), these divided pieces can be further attached to and detached from the forklift. It can be done easily and quickly.

Further, in the present invention, the vehicle portion (50), the elevating guide portion (60) provided in front of the vehicle portion (50), and the elevating portion (70) that moves up and down along the elevating guide portion (60). ), And the forklift (100) that supports the load from below by the pair of left and right forks (71) of the elevating part (70) and conveys the load, the load drop prevention device (1) having the above configuration according to the present invention. It is characterized by being prepared.

According to the present invention, in a forklift equipped with a load fall prevention device, it is possible to inexpensively and surely prevent the load from rolling and prevent the forklift from falling with a simple configuration.

According to the present invention, there is an effect that the load can be prevented from rolling and falling at low cost and reliably with a simple configuration.

It is a perspective view which looked at the forklift which attached the load fall prevention device which concerns on this invention from the front. It is a perspective view which looked at the load fall prevention device of the forklift which concerns on this invention from an oblique front. It is a perspective view which shows the load fall prevention device attached to the backrest of a forklift. FIG. 3 is a view in the direction of arrow A in FIG. It is a figure which shows the state which the load is put on the elevating part of a forklift. It is a perspective view which shows another form of the load fall prevention device which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[Basic configuration of forklift]
First, the basic configuration of the forklift to which the load dropping device according to the present invention is attached will be described below with reference to FIG.

FIG. 1 is a perspective view of a forklift equipped with a load drop device according to the present invention. The forklift 100 shown in the figure includes a vehicle unit 50, an elevating guide unit 60 erected in front of the vehicle unit 50, and an elevating unit 70 that moves up and down along the elevating guide unit 60. A pair of left and right forks 71 of the portion 70 supports a load 200 (see FIG. 5) such as a container or a basket from below and conveys the load 200. The load fall prevention device 1 is detachably attached. In the following description, the arrow directions shown in FIG. 1 are referred to as "front-back", "left-right", and "up-down" directions, respectively.

The vehicle unit 50 travels by using an internal combustion engine or an electric motor (not shown) as a drive source, and includes a vehicle body 53 supported by a pair of left and right front wheels 51 and rear wheels 52 so as to be able to travel on a road surface. .. The vehicle body 53 is provided with a seat 54 for an operator to sit on, and a steering wheel 55 is provided in front of the seat 54.

The elevating guide portion 60 includes a pair of left and right masts 61 that can be tilted in the front-rear direction and can be expanded and contracted in the up-down direction, respectively, and an elevating portion 70 is placed along the mast 61 between these masts 61. A chain transmission mechanism 62 for moving up and down is provided.

The elevating portion 70 includes a pair of left and right forks 71 that support the load 200 from below, and a front-view rectangular frame-shaped backrest 72 that supports the load 200 from the rear, and these forks 71 and the backrest 72 are connected to each other. The elevating guide unit 60 moves up and down integrally along the left and right masts 61. A load drop prevention device 1 is detachably attached to a horizontal upper member 72A (see FIG. 4) extending in the left-right direction at the upper end of the backrest 72 constituting the elevating portion 70. Here, the configuration of the load drop prevention device 1 according to the present invention will be described below with reference to FIGS. 2 and 3.

[Load fall prevention device]
FIG. 2 is a perspective view of the load fall prevention device of the forklift according to the present invention as viewed diagonally from the front. Further, FIG. 3 is a perspective view showing a load fall prevention device attached to the backrest of the forklift, and FIG. 4 is a view in the direction of arrow A in FIG. As shown in FIG. 2, the load drop prevention device 1 according to the present invention has a base portion 2 extending horizontally in the width direction (left-right direction) and a base portion 2 horizontally and parallel to each other from the left and right ends of the base portion 2 toward the front. It is configured in a U-shape in a plan view including a pair of left and right guard portions 3 extending. Here, the base portion 2 of the load fall prevention device 1 is made of a steel angle material having an L-shaped cross section, and the left and right guard portions 3 are made of a steel rectangular pipe material, respectively. There is. Therefore, the left and right guard portions 3 are ensured to have high strength and rigidity in terms of their cross-sectional shape. The base end portions of the left and right guard portions 3 are welded at right angles to the left and right end portions of the base portion 2.

A rectangular frame 4 is attached to the lower surface of each of the left and right guard portions 3 of the load fall prevention device 1 by welding with a steel round bar or a round pipe, and in the space surrounded by each rectangular frame 4. , A lightweight plate 5 made of resin or paper having the same shape as the space is attached. Here, each plate 5 serves as a mark for the operator, and in the present embodiment, each plate 5 is attached to each rectangular frame 4 by a plurality of resin bands 6. Specifically, a plurality of (seven in the illustrated example) circular holes 5a are formed on the outer peripheral edge of each plate 5, and each plate 5 passes through each of the circular holes 5a formed therein. The resin band 6 is attached to each rectangular frame 4 and is vertically suspended and supported on the lower surface of each guard portion 3. Since each plate 5 is for allowing the operator to visually recognize the presence of the left and right guard portions 3 located at the height of the operator's face, the plates 5 have a highly distinguishable color different from the surrounding parts. Is desirable to be used.

As shown in FIG. 3, in the load fall prevention device 1 configured as described above, the backrest 72 of the forklift 100 is provided with a clamp metal fitting (clamp jig) 7 at one location near the substantially central portion in the width direction of the base portion 2. It is detachably attached to the upper end of (see FIG. 1). Here, as shown in FIG. 4, the upper member 72A extending horizontally along the width direction of the upper end portion of the backrest 72 is composed of a steel angle member having a U-shaped vertical cross section, and the upper member By sandwiching the base portion 2 of the load fall prevention device into the 72A by the clamp metal fitting 7, one place of the load fall prevention device 1 is detachably attached to the upper member 72A (see FIG. 3) of the backrest 72. Since the configuration of the clamp metal fitting 7 is known, the description thereof will be omitted.

Further, as shown in FIGS. 3 and 4, both ends of the horizontal base portion 2 of the load fall prevention device 1 are provided with detachment prevention metal fittings for preventing the load drop prevention device 1 from coming off from the backrest 72. (Disengagement prevention device) 8 is provided respectively. Here, as shown in detail in FIG. 4, each detachment prevention metal fitting 8 is a side view U-shaped channel material 9 welded to both left and right ends of the base portion 2 of the load drop prevention device 1 (in FIG. 4). (Only one is shown), the bolt 10 passed through the upper and lower overhang portions 9A and 9B of the channel material 9, and the nut 11 welded to the lower surface of the overhang portion 9B below the channel material 9. ..

Therefore, before passing the bolt 10 through the channel material 9 of the detachment prevention metal fitting 8, the channel material 9 is fitted into the upper member 72A of the backrest 72 from the front, and then, as shown in FIG. 4, the channel material 9 is fitted. The bolt 10 is passed through the upper and lower overhang portions 9A and 9B of the bolt 10, and the lower end screw portion 10a of the bolt 10 is screwed into the nut 11 to set the disengagement prevention metal fitting 8. In this embodiment, the detachment prevention metal fitting 8 can be applied to forklifts of various models having different height dimensions (width dimensions in the vertical direction) of the upper member 72A of the backrest 72. The vertical width of the channel material 9 of each detachment prevention metal fitting 8 is set according to the maximum height of the upper member 72A of the backrest 72. In the present embodiment, since the height dimension of the upper member 72A of the backrest 72 is smaller than the vertical width of the channel material 9 of the detachment prevention metal fitting 8, the space between the channel material 9 and the upper member 72A of the backrest 72 is A gap δ is formed. However, this gap δ is not large enough to allow the load fall prevention device 1 to come off from the backrest 72, and the left and right runout angles centered on the clamp metal fitting 7 of the load fall prevention device 1 are within a predetermined value. The value is set to such an extent that the load drop prevention device 1 can be prevented from coming off from the backrest 72.

FIG. 5 is a diagram showing a state in which a load is placed on the elevating part of the forklift. As shown in FIGS. 3 and 5, in the load fall prevention device 1 according to the present invention, the width dimension W between the pair of left and right guard portions 3 is set to be slightly larger than the width dimension of the load 200. In addition, the inner surface of the tip of each guard portion 3 is a tapered surface 3a that inclines outward in the width direction toward the tip.

In the forklift 100 provided with the load fall prevention device 1 configured as described above, even when the load 200 supported by the pair of left and right forks 71 of the elevating part 70 is tilted to the left or right during transportation, this load is used. Since the left-right tilt of the 200 is regulated by abutting on either of the left and right guard portions 3 of the load fall prevention device 1, it is possible to reliably prevent the load 200 from falling from the fork 71 due to the shaking or tilting. can. Further, such an effect can be achieved by using the load drop prevention device 1 having a relatively simple structure in a U-shape in a plan view without requiring various sensors or control devices on the elevating part 70 (on the backrest 72) of the forklift 100. It is obtained by a simple configuration that is simply attached to the member 72A).

Then, in the present embodiment, one part of the base portion 2 of the load drop prevention device 1 is detachably attached to the elevating portion 70 (upper member 72A of the backrest 72) of the forklift 100 by the clamp metal fitting 7. Therefore, the load drop prevention device 1 can be easily attached to the elevating part 70 of the forklift 100 with one touch, or can be easily removed from the elevating part 70, if necessary. Since the attachment / detachment of the load drop prevention device 1 can be easily attached / detached regardless of the model of the forklift 100, its versatility is enhanced.

Further, in the present embodiment, the detachment prevention metal fittings 8 for preventing the forklift 100 of the load drop prevention device from coming off from the elevating portion 70 are attached to the left and right ends of the base portion 2 of the load drop prevention device 1, respectively. When one location of the base portion 2 of the load drop prevention device 1 is attached to the elevating portion 70 of the forklift 100 by the clamp metal fitting 7 as in the embodiment, the load drop prevention device 1 is tilted to the left or right with respect to the attachment point. Even in this case, the inclination is regulated by the pair of left and right anti-disengagement fittings 8. Therefore, it is possible to reliably prevent the occurrence of a problem that the load fall prevention device 1 comes off from the elevating portion 70 of the forklift 100 and falls off.

By the way, in the present embodiment, the pair of left and right guard portions 3 of the load fall prevention device 1 are located at a height close to the worker's face, but the work is performed by the plate 5 whose presence of these guard portions 3 is a mark. Since it is visible to the person, high safety of the worker can be ensured.

Further, as shown in FIGS. 3 and 5, in the load fall prevention device 1, the width dimension W between the pair of left and right guard portions 3 is set to a dimension slightly larger than the width of the load 200, and each guard is set. Since the inner surface of the tip portion of the portion 3 is a tapered surface 3a that is inclined outward in the width direction toward the tip portion, the following effects can be obtained. That is, when the pair of left and right forks 71 of the forklift 100 is inserted into the space below the load and the load is loaded on the fork 71, the left and right sides of the load 200 are the tips of the pair of left and right guard portions 3 of the load drop prevention device 1. Since it is guided by the tapered surface 3a formed on the inner surface, the loading operation of the load on the fork 71 can be performed smoothly and quickly.

Here, another form of the load fall prevention device is shown in FIG.

FIG. 6 is a perspective view showing another embodiment of the load fall prevention device according to the present invention. In this embodiment, the load drop prevention device 1 is divided into two left and right divided pieces 1L and 1R, and each of the divided pieces 1L and 1R has an elevating part 70 of the forklift 100 (see FIG. 1) at one location thereof by a clamp metal fitting 7. It is configured to be detachably attached to each. In FIG. 6, the same elements as those shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted below.

If the load drop prevention device 1 is divided into two parts on the left and right as in the present embodiment, the divided pieces 1L and 1R are lightweight (1/2 of the weight of the integrated load drop prevention device 1 shown in FIG. 2). The divided pieces 1L and 1R can be attached to and detached from the forklift 100 more easily and easily. Further, the load fall prevention device 1 according to the present embodiment also has an effect that the load can be prevented from rolling and falling at low cost and reliably with a simple configuration.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of claims and the technical ideas described in the specification and drawings.

1 Load fall prevention device 1L, 1R Load drop prevention device split piece 2 Base part 3 Guard part 3a Tapered surface 4 Rectangular frame 5 Plate 7 Clamp fitting (clamp jig)
8 Detachment prevention metal fittings (disengagement prevention tool)
50 Vehicle part 60 Lifting guide part 61 Mast 70 Lifting part 71 Fork 72 Backrest 100 Forklift W Width dimension between left and right guard parts

Claims (7)

A vehicle unit, an elevating guide unit provided in front of the vehicle unit, and an elevating unit that moves up and down along the elevating guide unit are provided, and the load is supported from below by a pair of left and right forks of the elevating unit. It is a load fall prevention device attached to the forklift that carries it.
Detachably attached to the elevating part of the forklift,
A load fall prevention device including a base portion extending in the width direction and a pair of left and right guard portions extending parallel to each other from the left and right ends of the base portion toward the front. The load drop prevention device according to claim 1, wherein at least one portion of the base portion is detachably attached to the elevating portion of the forklift by a clamp jig. The load fall prevention measure according to claim 2, wherein a disengagement preventive device for preventing the forklift of the forklift from coming off from the elevating part is attached to both left and right ends of the base portion. The load fall prevention device according to any one of claims 1 to 3, wherein a plate serving as a mark is suspended and supported by the pair of left and right guard portions. The width dimension between the pair of left and right guard portions is set to be slightly larger than the width of the load, and the inner surface of the tip portion of each guard portion is a tapered surface inclined outward in the width direction toward the tip. The load fall prevention device according to any one of claims 1 to 4, wherein the device is characterized by the above. The invention according to any one of claims 1 to 5, wherein each of the divided pieces is divided into two parts on the left and right, and at least one of the divided pieces is detachably attached to the elevating part of the forklift by the clamp jig. Load fall prevention device. A vehicle unit, an elevating guide unit provided in front of the vehicle unit, and an elevating unit that moves up and down along the elevating guide unit are provided, and the load is supported from below by a pair of left and right forks of the elevating unit. It is a forklift that carries
A forklift comprising the load fall prevention device according to any one of claims 1 to 6.

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