Dump truck bed covering device

Abstract

To provide a loading space covering device capable of removably attaching a loading space cover onto a loading space, with high attachment force and without modifying the loading space.SOLUTION: A loading space covering device is equipped with: a detachable loading space cover 30; and a detachable support device 40 immovably installed at an inside front part of a loading space 11. The loading space cover 30 is equipped with a plurality of suspension belts 36 attached integrally to a bottom film 31. The support device 40 is equipped with at least: a pair of pressing plates 41, 41 arranged on an inside front surface of the loading space 11; and an expandable / contractible beam 42 which is horizontally laid between the pressing plates and is equipped with a length adjustment function. The loading space cover 30 can be moored to a locking element at a part of the support device 40 via the suspension belts 36.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a covering technology for covering the inner surface of a loading platform with a sheet-made loading platform cover, and more particularly to a loading platform covering device for a dump truck that prevents the loading platform cover from sliding off together with the load when dumping up and allows the loading platform cover to be replaced with a simple operation when necessary. [Background technology]

[0002] When transporting loads such as earth and sand using a dump truck, it is known to cover the floor of the dump truck bed with a single protective sheet in order to protect the floor of the dump truck bed and prevent the load from sticking to it. If the floor of the loading platform is simply covered with a protective sheet, the protective sheet will slide off along with the load when the vehicle is dumped, so the protective sheet must be fixed to the loading platform for repeated use.

[0003] Known methods for attaching a protective sheet to the floor of a cargo bed include using an adhesive to attach the protective sheet (Patent Document 1) and using bolts, nuts, and strips to secure the protective sheet (Patent Document 2).

[0004] Another known means of fixing a protective sheet to the floor of a cargo bed is to attach a pipe support to the front end of the cargo bed, attach multiple shackles to the pipe support, and connect the buffer sheet to the pipe support via each shackle (Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 52-130312 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-51029 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-101728 Summary of the Invention [Problem to be solved by the invention]

[0006] Conventional techniques for attaching protective sheets involve the following problems. <1> The attachment technique described in Patent Document 1 uses a strong adhesive, so once attached, the protective sheet cannot be easily removed. <2> The mounting technique described in Patent Document 2 requires the loading platform to be pre-processed by welding multiple receiving brackets, which increases the cost of modifying the loading platform. <3> The dimensions (width and length) of dump truck beds vary depending on the manufacturer and are not uniform. Therefore, the mounting fixtures used to attach the protective sheet to the cargo bed are specialized products made to fit specific cargo bed dimensions, and are not very versatile. <4> In the mounting method described in Patent Document 3, in which a buffer sheet is attached via one pipe support and multiple shackles, the pipe body of the pipe support is pulled by the buffer sheet during dumping, causing it to bend, thereby reducing the mounting force of the pipe support. If the mounting force of the pipe support is insufficient, the pipe support will slide down inside the loading platform along with the buffer sheet. <5> The attachment means described in Patent Document 3 has a structure in which the buffer sheet is supported at points via shackles, so when dumping up, the load is concentrated at the connection points of the shackles, making the connection parts of the buffer sheet prone to breaking.

[0007] The present invention has been made in view of the above points, and its object is to provide a bed covering device for a dump truck that can solve the above problems. [Means for solving the problem]

[0008] The present invention provides a bed covering device for a dump truck, comprising: a removable bed cover with a bottom structure that can cover the floor and peripheral walls of the bed of a dump truck; and a removable support device that is immovably installed on the inside front part of the bed and positions the bed cover by receiving a reaction force from the inside of the bed, wherein the bed cover comprises a bottom membrane that covers the floor of the bed, a peripheral membrane that covers the peripheral walls of the bed, and a plurality of suspension belts that are attached integrally to the bottom membrane, and the support device comprises at least a pair of pressure plates arranged opposite each other on the inside of the side walls of the bed, and one or more telescopic beams that are hung horizontally between the pressure plates and have a length adjustment function, and the pair of pressure plates, the length of which is adjusted to match the installation width of the bed, are detachable from the inside front of the bed, and the bed cover can be moored to a hooking element that is a part of the support device via the suspension belt. In another embodiment of the present invention, the mounting force of the support device to the loading platform is configured to be greater than the anticipated sliding force of the load acting on the loading platform cover. In another embodiment of the present invention, the cargo bed cover has a liquid-tight structure. In another embodiment of the present invention, the suspension belts are attached to at least both sides of the bottom membrane of the bed cover. In another aspect of the present invention, the suspension belt has a reinforcing portion integrated along the longitudinal direction of the bottom membrane of the cargo bed cover and a mooring portion protruding forward of the bottom membrane, and can be moored to the mooring portion and a part of the support device. In another embodiment of the present invention, the hooking elements of the support device are cantilevers protruding from the opposing surfaces of the pair of pressure plates. In another embodiment of the present invention, the hooking elements of the support device are telescopic beams that are hung horizontally on the opposing surfaces of the pair of pressure plates. [Effects of the Invention]

[0009] The present invention has at least one of the following advantages. <1> In the present invention, instead of fixing and attaching the cargo bed cover directly to the cargo bed, a suspension belt attached integrally to the bottom membrane of the cargo bed cover is attached to a support device installed at the front inside of the cargo bed. Therefore, the loading platform cover can be attached using a simple attachment structure without any modification to the loading platform. <2> When dumping up, the bed cover can be hung down from the bed to prevent the bed cover from slipping off, so that the bed cover can be used repeatedly. <3> The cargo bed cover has a bottom structure and is highly waterproof (water-tight), so even if the cargo contains liquid, leakage can be reliably prevented during transportation. <4> The mounting force of the support device to the bed is configured to be superior to the sliding force of the load acting on the bed cover, so even if the sliding force of the load acts on the bed cover during dumping, the bed cover can maintain a state of hanging down from the support device. <5> Due to the reinforcing effect of the suspension belts attached to the bottom membrane of the bed cover, the bottom membrane of the bed cover is less likely to break even if the load slides off during dumping. <6> The width of the support device can be adjusted arbitrarily by adjusting the length of the telescopic beam. Therefore, even if the width dimensions of the loading platform differ slightly depending on the manufacturer, the support device can be adjusted and installed on-site, eliminating the need to manufacture dedicated products for each manufacturer. <7> Since the bed cover is detachable from the support device, the bed cover can be easily replaced while leaving the support device on the bed. <8> Since the support device is detachable from the loading platform, the support device can be removed from the loading platform simply by narrowing the width of the support device as needed. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram of the relationship between the bed covering device according to the first embodiment of the present invention and the bed of a dump truck; [Figure 2] Exploded view of the loading platform cover that constitutes the loading platform covering device [Figure 3] A plan view of a bed covering device attached to the bed of a dump truck with a portion broken away [Figure 4] Cross-sectional view of IV-IV in Figure 3 [Figure 5]A perspective view of the support device for the loading platform covering device and the loading platform cover with a portion thereof omitted. [Figure 6] Explanatory diagram of the telescopic beam's telescopic mechanism [Figure 7] An explanatory diagram of a method for installing a support device that constitutes a loading platform covering device, (A) is a cross-sectional view of the support device, and (B) is a plan view of the support device. [Figure 8] An explanatory diagram of the operation of the loading platform covering device. (A) is a model diagram of the loading platform covering device when the loading platform is horizontal, and (B) is a model diagram of the loading platform covering device when the loading platform is dumped up. [Figure 9] 1A is a plan view of the loading platform covering device when looking up at the bottom membrane of the loading platform cover, and FIG. 1B is a cross-sectional view of the loading platform covering device according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Example 1] 1. Dump truck FIG. 1 shows an example of a dump truck 10 to which a bed covering device 20 is attached. The dump truck 10 is a rear dump truck equipped with a liftable loading platform 11 . The loading platform 11 has a flat floor surface 12, a front wall 13 that covers all four sides of the floor surface 12, a pair of side walls 14, and a rear door 15. In this example, the rear door 15 is described as being of an upward opening type (F gate), but the rear door 15 may also be of a downward opening type.

[0012] In the following explanation, the "front" refers to the forward direction side of the dump truck 10, and the "width dimension" of the loading platform 11 refers to the width in a direction perpendicular to the longitudinal direction of the loading platform 11.

[0013] 2. Cargo bed covering device The bed covering device 20 of the dump truck 10 is a device for suspending and covering the bed cover 30 so that the bed cover 30 does not slide off when the bed 11 is dumped up. The loading platform covering device 20 comprises a box-shaped loading platform cover 30 that is manufactured so as to be able to cover the inner peripheral surface of the loading platform 11, and a support device 40 that positions the loading platform cover 30 inside the loading platform 11. The support device 40 can be attached to and detached from the loading platform 11, and the loading platform cover 30 can be attached to and detached from the support device 40.

[0014] <1> Cargo cover (Figures 1 and 2) The bed cover 30 is a waterproof box body made of a sheet-like material sized to cover the inner surface of the bed 11 of the dump truck 10 . FIG. 2 shows an example of a developed view of the bed cover 30 as seen from below, and the dashed dotted lines in the figure indicate the folding lines of the seat.

[0015] The cargo bed cover 30 comprises a bottom membrane 31 that covers the floor surface 12 of the cargo bed 21, a peripheral membrane 32 (front membrane 33, pair of side membranes 34 and door membrane 35) that covers the peripheral walls of the cargo bed 21 (front wall 13, pair of side walls 14 and rear door 15), and a plurality of suspension belts 36 that are integrally attached to a portion of the bottom membrane 31 along the sliding direction of the cargo. The cargo bed cover 30 has a bottom structure in which a bottom membrane 31 and a peripheral membrane 32 are joined together, and has high waterproof properties (waterproofness).

[0016] <1.1> Material of the cargo bed cover The material of the bed cover 30 may be a resin sheet such as a rubber sheet that is highly durable and waterproof, or a known waterproof sheet such as polyester.

[0017] <1.2> Bottom membrane The bottom membrane 31 is a rectangular sheet that covers the floor surface 12 of the loading platform 11 . The four sides of the bottom membrane 31 are formed with a peripheral membrane 32 (a front membrane 33, a pair of side membranes 34, and a door membrane 35) that is continuous with the bottom membrane 31.

[0018] <1.3> Peripheral membrane (Figs. 1 and 2) The surrounding film 32 is a rectangular sheet that covers the inner surfaces of the front wall 13, side walls 14, and rear door 15 of the cargo bed 11. The peripheral film 32 is made up of a front film 33 covering the front wall 13 , a pair of side films 34 covering the side walls 14 , and a door film 35 covering the rear door 15 .

[0019] The joining portions of the side edges of the films 33 to 35 constituting the peripheral film 32 are joined by fusion, adhesion or the like to provide high water-stopping properties so as to prevent water leakage. A fan-shaped folding membrane 35a is interposed between the side membrane 34 and the door membrane 35, and the door membrane 35 is configured to be able to tilt independently by the expansion and contraction of the folding membrane 35a.

[0020] The front membrane 33 is preferably set to a dimension higher than the height of the side wall 14 of the loading platform 11 . This is to allow the front film 33 to freely deform when cargo is placed inside the bed cover 30.

[0021] The front membrane 33 can be attached to and detached from an extendable beam 42 that is part of the support device 40 . The side membrane 34 and the door membrane 35 can be attached to and detached from a part of the loading platform 11.

[0022] The side film 34 may be sized to cover only the inner surface of the side wall 14, or may be sized to cover both the inner and outer surfaces of the side wall 14.

[0023] <1.4> Suspension belt (Figs. 2-4) A plurality of suspension belts 36 are attached integrally to the bottom membrane 31 of the bed cover 30 along the longitudinal direction of the bottom membrane 31.

[0024] <1.4.1> Function of the suspension belt In the present invention, the cargo bed cover 30 is not directly fixed and attached to the cargo bed 11, but the front edge of the bottom membrane 31 that constitutes the cargo bed cover 30 is attached to a support device 40 positioned inside the cargo bed 11. If the front edge of the bottom membrane 31 is simply attached directly to the support device 40, the load will be concentrated on the bottom membrane 31 during dump-up, making the bottom membrane 31 prone to breakage.

[0025] Therefore, in the present invention, the bottom membrane 31 is attached to the support device 40 via a suspension belt 36, which is configured to distribute the load acting on the bottom membrane 31 during dump-up and prevent the bottom membrane 31 from being damaged.

[0026] <1.4.2> Configuration of suspension belt The suspension belt 36 has a reinforcing portion 36a attached integrally along the longitudinal direction of the bottom membrane 31, and a loop-shaped anchoring portion 36b formed continuously at the front portion of the reinforcing portion 36a. The suspension belt 36 may be made of a material such as polyester having excellent tensile strength woven into a belt shape. The reinforcing portion 36a and the anchoring portion 36b may be formed from the same belt material, or may be formed from separate belt materials.

[0027] <1.4.2.1> Reinforcement The reinforcing portion 36 a has a length substantially equal to the entire length of the bottom membrane 31 . By integrally providing the reinforcing portion 36a over the entire length of the bottom membrane 31, it is possible to increase the tensile strength over the entire length of the bottom membrane 31. The bottom membrane 31 and the reinforcing portion 36a can be integrated together by, for example, sewing or adhesive means. Since the bottom membrane 31 can be reinforced by the reinforcing portion 36a, the bottom membrane 31 does not need to be made entirely of a high-strength material, and an inexpensive material can be used for the bed cover 30.

[0028] <1.4.2.2> Mooring section The anchoring portion 36b is a connecting element that protrudes forward from the front edge of the bottom membrane 31 and can be engaged with and disengaged from the cantilever beam 43 of the support device 40.

[0029] <1.4.3> Number of suspension belts installed In this example, two suspension belts 36 are attached to both the left and right side edges of the bottom membrane 31, but three or more suspension belts 36 may be installed at intervals.

[0030] <2> Support device (Fig. 1, 5) The support device 40 is a metal support structure for attaching the bed cover 30 to the inside of the bed 11. The support device 40 comprises a pair of opposing pressure plates 41, 41, one or more telescopic beams 42 with length adjustment function (extension function) that are horizontally placed between the pressure plates 41, 41, and rod-shaped cantilever beams 43 that protrude from each of the opposing surfaces of the pressure plates 41, 41. The support device 40 is formed as a unit by fixing both ends of an expandable beam 42 to a pair of pressure plates 41, 41. The support device 40 is capable of adjusting the pressing distance between the pair of pressing plates 41, 41 by adjusting the length of the expandable beam 42.

[0031] <2.1> Pressure plate (Figs. 3-5) The pressure plate 41 is a friction-resistant flat plate that abuts against the inner surfaces of the left and right side walls 14, 14 of the loading platform 11 of the dump truck 10 to position it. There are no particular restrictions on the overall shape of the pressure plate 41, and although a rectangular pressure plate 41 will be described in this example, other shapes such as a polygon, a circle, or an ellipse may also be used.

[0032] <2.2> Telescopic beam (Figs. 3-5) The expandable beam 42 is a member that supports the space between the pair of pressure plates 41, 41. The telescopic beam 42 includes a rod-shaped or pipe-shaped beam body 42a and a telescopic mechanism 42b provided at the end of the beam body 42a.

[0033] <2.2.1> Fixing of expansion beam and pressure plate Regarding the mounting structure of the telescopic beam 42 and pressure plate 41 illustrated in this example, a contact plate 42c is fixed to the outer end of the telescopic mechanism 42b located at the end of the telescopic beam 42 by welding or the like, and the plate 42c is fixed to the pressure plate 41 by welding or the like.

[0034] <2.2.2> Telescoping mechanism The expansion and contraction mechanism 42b is a length adjustment mechanism for adjusting the overall length of the expansion and contraction beam 42. Regarding the screw-type telescopic mechanism 42b illustrated in Figure 6, the screw-type telescopic mechanism 42b is equipped with a bolt 42d inserted into the end of the beam body 42a and a nut 42e rotatably screwed onto the bolt 42d, and the overall length of the telescopic beam 42 is adjusted by rotating the nut 42e forward or backward. The expansion mechanism 42b is not limited to a screw type, but may be a fluid type.

[0035] <2.2.3> Installation position of telescopic mechanism The installation position of the expansion mechanism 42b relative to the expansion beam 42 will be described with reference to FIG. In this example, the extension mechanism 42b is disposed at both ends of the beam body 42a, but the extension mechanism 42b may be provided at one end of the beam body 42a or inserted in the middle of the beam body 42a.

[0036] <2.3> Number of expansion beams (Fig. 4, 5) In this example, three extendable beams 42 are arranged in three locations between a pair of opposing pressure plates 41, 41, in front, behind, above and below the pressure plate 41, but the number of extendable beams 42 installed is not limited to three. The number of the expandable beams 42 may be one or two, or may be four or more.

[0037] <2.4> Cantilever beam (Fig. 5) The cantilever beam 43 is a retaining element for retaining the mooring portion 36b of the suspension belt 36 provided on the bed cover 30. The cantilever beam 43 has a rod-shaped or pipe-shaped hook body 43a protruding from the opposing surface of the pressure plate 41, and a stopper 43b provided at the tip of the hook body 43a. The hook body 43a is fixed to the inner surface of the pressure plate 41 via a contact plate 43c by welding or the like.

[0038] <3> Mounting force of support device In the present invention, the mounting force of the support device 40 (frictional resistance force at the contact surface between the pressure plate 41 and the inner surface 14a of the side wall 14 of the loading platform 11) is configured to be superior to the anticipated sliding force of the cargo acting on the loading platform cover 30.

[0039] In the present invention, the mounting force of the support device 40 can be adjusted by changing the size of the pressure plate 41 and the number of expansion and contraction beams 42 installed. By increasing the area of ​​the pressure plate 41, the contact area with the inner surface 14a of the side wall 14 of the loading platform 11 increases, and the pressing force against the inner surface 14a of the side wall 14 of the loading platform 11 via the pressure plate 41 increases in proportion to the number of telescopic beams 42 installed. Therefore, the size of the pressure plate 41 and the number of expandable beams 42 to be installed are appropriately selected so that the positioning force of the support device 40 can withstand the anticipated sliding force of the load acting on the loading platform cover 30.

[0040] [How to use the cargo bed covering device] 1. How to install the cargo bed covering device The method of installing the support device 40 and the bed cover 30 that constitute the bed covering device 20 will now be described.

[0041] <1> Pre-installation of support equipment A method for installing the support device 40 will be described with reference to FIG. The support device 40 is placed in front of the loading platform 11 with the pair of pressure plates 41, 41 facing the inner surface 14a of the side wall 14 of the loading platform 11 (FIG. 7(A)).

[0042] <2> Mounting by tensioning the support device Next, the expansion and contraction mechanisms 42b expand the expansion and contraction beams 42, gradually widening the opposing distance between the pair of pressure plates 41, 41. The extension of the telescopic beam 42 continues, and the pair of pressure plates 41, 41 is pressed against the inner surface 14a of the side wall 14 of the loading platform 11 (FIG. 7(B)). The expansion operation of each of the extensible beams 42 is continued until the pressure plates 41, 41 reach a predetermined pressing force (tensioning force).

[0043] In this way, the length of the telescopic beam 42 is adjusted inside the loading platform 11 to match the installation width of the loading platform 11, and the pair of pressure plates 41, 41 are pressed firmly against the inner surface 14a of the side wall 14 of the loading platform 11, thereby attaching the support device 40 to the front of the loading platform 11 so that it cannot be displaced.

[0044] The width dimension (stretching dimension) of the support device 40 can be adjusted arbitrarily by adjusting the length of the expandable beam 42. Therefore, even if the width dimension of the loading platform 11 varies slightly depending on the manufacturer, the support device 40 can be adjusted and installed on-site, eliminating the need to manufacture a dedicated product for each manufacturer and providing high versatility.

[0045] <3> Installing the cargo bed cover (Figures 1, 3, and 4) As shown in FIG. 1, a box-shaped bed cover 30 manufactured to fit the dimensions of the bed 11 of the dump truck is placed on the inside of the bed 11. At this time, the bottom membrane 31, side membrane 34, and door membrane 35 of the cargo bed cover 30 are placed over the floor surface 12, side wall 14, and rear door 15 of the cargo bed 11, respectively.

[0046] <3.1> Mooring of the suspension belt (Fig. 4, 5) The anchoring portion 36 b of the suspension belt 36 provided on the bottom membrane 31 is anchored to the cantilever beam 43 of the support device 40 . With the anchoring portion 36b of the suspension belt 36 anchored to the support device 40, the bottom membrane 31 is extended rearward of the platform 11. A stopper 43b provided on the cantilever beam 43 prevents the mooring portion 36b hooked on the hook body 43a from falling off.

[0047] <3.2> Installing the cargo bed cover membrane The front membrane 33 of the bed cover 30 is attached to the upper telescopic beam 42 of the support device 40 via a connecting member 38 (FIGS. 3 and 4). To attach the front membrane 33 in an upright position, for example, multiple eyelets 37 can be formed around the periphery of the front membrane 33, and the membrane can be attached to the telescopic beam 42 of the support device 40 via connecting materials 38 such as ropes attached to the eyelets 37.

[0048] The side membrane 34 and the door membrane 35 of the bed cover 30 are attached to the bed 11 via connecting members 38 (FIGS. 1 and 2). To attach the side membranes 34 and door membranes 35 to the cargo bed 11, for example, multiple eyelets 37 can be formed around the periphery of each membrane 34-35, and the membranes can be attached to the cargo bed 11 via connecting materials 38 such as rubber bands or ropes attached to the eyelets 37.

[0049] As other means for attaching the membranes 34 to 35 to the loading platform 11, magnets, hook-and-loop fasteners, etc. may also be used.

[0050] 2. Function of the loading platform covering device during transportation and dumping The functions of the bed covering device 20 during transportation and dumping will now be described.

[0051] <1> Loading the payload FIG. 8A shows a state in which a load 50 such as earth and sand is loaded inside the load cover 30 installed on the load platform 11. By placing the load 50 inside the loading platform cover 30, the loading platform cover 30 is pushed outward within the loading platform 11. The side pressure of the load 50 is ultimately supported by the loading platform 11.

[0052] When the side pressure of the cargo 50 acts on the front membrane 33 of the bed cover 30, the front membrane 33 is allowed to deform freely, and the side pressure of the cargo 50 acting on the front membrane 33 can be supported by the support device 40 or the front wall 13 of the bed 11.

[0053] <2> Prevents leakage during transport The cargo bed cover 30 having a bottom structure has high waterproof properties (waterproof properties). Therefore, even if the cargo 50 contains liquid such as water, the liquid can be stored inside the bed cover 30, so that leakage of the liquid during transportation can be reliably prevented.

[0054] <3> Drooping action of the bed cover when dumping FIG. 8(B) shows the loading platform 11 in a dumped-up state. The cargo bed covering device 20 of the present invention has a structure in which the front part of the cargo bed cover 30 is hooked to a part of the support device 40 positioned within the cargo bed 11 via a suspension belt 36 attached to the bottom membrane 31 of the cargo bed cover 30.

[0055] In particular, the loading platform covering device 20 is configured so that the positioning force of the support device 40 is superior to the sliding force of the load 50 acting on the loading platform cover 30. Therefore, even if the inclination angle of the loading platform 11 increases during dumping and the sliding force of the load 50 acts on the loading platform cover 30, the loading platform cover 30 can maintain a state of hanging down from the support device 40.

[0056] Furthermore, since the attachment position of the suspension belt 36 is offset relative to the pressure plate 31, a rotational force is generated in the loading platform covering device 20 when the vehicle is dumped up. Since the rectangular pressure plates 41, 41 constituting the loading platform covering device 20 are in contact with the floor surface 12 of the loading platform 11, the rotation of the loading platform covering device 20 can be reliably restricted. Therefore, the positioning force of the loading platform covering device 20 does not decrease.

[0057] In this way, the loading platform cover 30 can be supported by hanging down from the loading platform 11 via the support device 40, so even if the inclination angle of the loading platform cover 30 increases together with the loading platform 11, the loading platform cover 30 does not slide down together with the load 50, and the loading platform cover 30 maintains its function of covering the inner surface of the loading platform 11. Therefore, only the cargo 50 stored in the bed cover 30 slides down along the bottom membrane 31 of the bed cover 30.

[0058] <4> Reinforcement of the cargo bed cover by the suspension belt When the load 50 slides down along the bottom membrane 31 of the bed cover 30, a tensile force acts on the bed cover 30 in the direction in which the load 50 slides down. The tensile force acting on the bed cover 30 is greatest on the bottom membrane 31 , and the tensile force acting on the side membranes 34 is relatively smaller than that on the bottom membrane 31 . The bottom membrane 31 of the bed cover 30, which is subjected to the greatest tensile force, is provided with a suspension belt 36 along its entire length to increase the strength of the thin bottom membrane 31. This effectively prevents the bottom membrane 31 from being easily torn and broken when the load 50 slides down.

[0059] <5> Reusable cargo cover After the load 50 has been discharged, the loading platform 11 is returned to its original horizontal position, and the loading platform cover 30 follows the loading platform 11 and returns to its horizontal position. The bed cover 30 covering the inner surface of the bed 11 can be reused to load new loads 50.

[0060] <6> Replacing the cargo bed cover When the number of repeated uses increases and the loading platform cover 30 becomes worn out, the loading platform cover 30 is removed from the support device 40 while the support device 40 is left on the loading platform 11, and replaced with a new loading platform cover 30. When replacing the cover, the suspension belt 36 of the cover 30 is replaced with respect to the support device 40, and the cover 30 can be replaced by a simple operation of simply attaching and detaching the periphery of the cover 30 to and from the cover 11.

[0061] <7> Removal of support equipment When it is desired to remove the support device 40 from the loading platform 11, the expansion beams 42 are contracted. The support device 40 can be easily removed from the loading platform 11 by a simple operation of narrowing the width of the support device 40 and separating the pressure plates 41, 41 from the side wall 14 of the loading platform 11. The dump truck 10 from which the support device 40 has been removed can be used for a different purpose. Furthermore, the removed bed cover 30 and support device 40 can be transferred to a separate dump truck 10 and used.

[0062] [Example 2] Other embodiments will be described below, and in the description, the same parts as those in the above-described embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0063] <1> Other means of fastening the suspension belt In the previous Example 1, a configuration was described in which the hanging element for hanging the suspension belt 36 of the cargo bed cover 30 is the cantilever beam 43 of the support device 40, but in this example, a configuration in which the hanging element is the extendable beam 42 of the support device 40 is described.

[0064] <2> Support Equipment The following description will be given with reference to Figure 9. The support device 40 of this example is composed of a pair of opposing pressure plates 41, 41, and a plurality of extendable beams 42 that are horizontally connected between the pressure plates 41, 41 and have a length adjustment function (extension function). In this example, it is assumed that a plurality of expandable beams 42 are laid horizontally between a pair of pressure plates 41, 41, and some of the expandable beams 42 are used as hook members for the mooring portions 36b of the suspension belt 36. In this example, the suspension belt 36 is hooked onto the extendable beam 42 located at the lowest position of the pressure plate 41, but the extendable beam 42 to which the suspension belt 36 is hooked may be selected to be of any height.

[0065] The telescopic beam 42 to which the suspension belt 36 is attached not only has the function of pressing and positioning a pair of pressure plates 41, 41, as in the previous Example 1, but also has the function of positioning the cargo bed cover 30 via the suspension belt 36.

[0066] The expansion beam 42 on which the suspension belt 36 is hooked undergoes some bending deformation during dump-up, but the other expansion beams 42 do not bend, so the necessary positioning force of the support device 40 can be secured. Therefore, even if the suspension belts 36 are hooked to some of the expansion beams 42, it is possible to reliably prevent the support device 40 from sliding down during dump-up.

[0067] <3> Cargo bed cover FIG. 9(A) shows the bed cover 30 as viewed from below the bottom membrane 31. The cargo bed cover 30 in this example has a bottom membrane 31 that covers the floor surface 12 of the cargo bed 21, a peripheral membrane 32 that covers the peripheral walls of the cargo bed 21, and a plurality of suspension belts 36 that are attached integrally to the entire bottom membrane 31. The reinforcing portion 36a of the suspension belt 36 is integrally attached to the bottom membrane 31 over the entire length thereof, as in the first embodiment.

[0068] <3.1> Installation interval of suspension belts In the previous Example 1, a configuration was described in which two suspension belts 36 were attached to both the left and right sides of the bottom membrane 31, but in this example, multiple suspension belts 36 may be attached at intervals across the entire bottom membrane 31, and these multiple suspension belts 36 may be hooked onto specific telescopic beams 42.

[0069] The spacing between the suspension belts 36 and the bottom membrane 31 may be uniform or non-uniform. The installation positions and intervals of the suspension belts 36 can be selected appropriately depending on the type of cargo, etc.

[0070] <3.2> When a suspension belt is installed at the center of the bottom membrane Generally, when a load such as soil or sand is loaded, the loaded load does not slide down evenly during dumping, and the load located in the center of the bed floor slides down before the loads located on either side. This is because the loads located on both sides of the loading platform come into contact with the side walls of the loading platform, increasing the contact area and delaying the start of the slide.

[0071] As illustrated in Figure 9(A), if a suspension belt 36 is added near the center of the bottom membrane 31 to reinforce it, even if a tensile force acts on the center of the bottom membrane 31 of the bed cover 30 first during dumping, the tensile force acting on the center of the bottom membrane 31 can be supported by the bed 11 through the suspension belt 36 and the support device 40. Therefore, the effect of preventing the bottom film 31 from breaking during dump-up is further improved.

[0072] Furthermore, a cross reinforcing belt 39 may be attached integrally to the front end of the bottom membrane 31 in the crossing direction of the suspension belt 36 in some cases. The cross reinforcing belts 39 can be made of the same material as the suspension belts 36. By additionally installing the cross reinforcing belts 39, the load transmission at the front end of the bottom membrane 31 can be improved, so that wrinkles are less likely to occur in the bottom membrane 31 of the bed cover 30 after dumping up.

[0073] <4> Effects of this example The effects of this embodiment are basically the same as those of the first embodiment described above.

[0074] In particular, this example provides the following effects. 1) By omitting the cantilever beam 43, the support device 40 can be made small and lightweight. 2) By hooking the suspension belt 36 to the telescopic beam, the suspension belt 36 can be attached and hooked at any position on the bottom membrane 31 of the bed cover 30. 3) The reinforcing effect of the bottom membrane 31 of the bed cover 30 is improved in proportion to the number of suspension belts 36 installed. [Explanation of symbols]

[0075] 10. Dump truck 11. Dump truck bed 11. Cargo floor 12. Front wall of the loading platform 13. Side wall of loading platform 14 Rear door of the loading platform 20. Loading bed covering device 30····Cargo bed cover 31. Bottom membrane of cargo bed cover 32.....Cargo bed cover membrane 33... anterior membrane 34. Side membrane of cargo bed cover 35. Door membrane for cargo bed cover 36. Cargo bed cover suspension belt 36a···Suspension belt reinforcement 36b... Suspension belt anchorage 38...Connecting material 39. Cross reinforcement belt 40...Suspension system 41 Pressure plate 42...Telescopic beam 42a...Beam body 42b...Extension mechanism 43 Cantilever beam 50... Load

Claims

1. A dump truck bed covering device comprising a removable bed cover having a bottom structure capable of covering the floor and peripheral walls of the bed of a dump truck, and a removable support device that is immovably installed on the inside front part of the bed and receives a reaction force from the inner surface of the bed to position the bed cover, The bed cover comprises a bottom membrane covering the floor surface of the bed, a peripheral membrane covering the peripheral wall of the bed, and a plurality of suspension belts integrally attached to the bottom membrane, The support device comprises at least a pair of pressure plates arranged opposite each other on the inner front surface of the side wall of the loading platform, and one or more telescopic beams with a length adjustment function that are laid horizontally between the pressure plates, and the pair of pressure plates with the length of the telescopic beams adjusted to match the installation width of the loading platform are detachable from the inner surface of the loading platform, The loading platform cover can be attached to a hook element of a support device via a suspension belt. Dump truck bed covering device.

2. 2. The bed covering device for a dump truck according to claim 1, characterized in that the attachment force of the support device to the bed is configured to be greater than the anticipated sliding force of the load acting on the bed cover.

3. 2. The dump truck bed covering device according to claim 1, wherein the bed cover has a liquid-tight structure.

4. 2. The bed covering device for a dump truck according to claim 1, wherein the suspension belts are attached to at least both sides of the bottom membrane of the bed cover.

5. The loading platform covering device for a dump truck as described in claim 1, characterized in that the suspension belt has a reinforcing portion integrated along the longitudinal direction of the bottom membrane of the loading platform cover and a mooring portion protruding forward of the bottom membrane, and the mooring portion can be moored to a part of the support device.

6. 2. The loading platform covering device for a dump truck according to claim 1, wherein the hooking elements of the support device are cantilever beams protruding from opposing surfaces of a pair of pressure plates.

7. 2. The loading platform covering device for a dump truck according to claim 1, wherein the hooking elements of the support device are expansion beams that are hung horizontally on opposing surfaces of a pair of pressure plates.

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