JP2006123771A - Track loading space lower part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a track loading space lower part structure for surely arranging a packing material between an upper surface of a chassis and an under surface of a vertical floor joist, and easily installing the vertical floor joist, a horizontal floor joist and the chassis in a predetermined place. <P>SOLUTION: A cross-sectional U-shaped under surface groove 22 long in the longitudinal direction of the vertical floor joist 21, is formed on the under surface of the vertical floor joist 21, and the packing material 14 is arranged in this under surface groove 22. One or a plurality of cross-sectional C-shaped side surface grooves 23 long in the longitudinal direction of the vertical floor joist 21, are formed on a side surface of the vertical floor joist 21, and an inclined face 24 inclining in the downward direction is formed in an edge part of an upper surface of the vertical floor joist 21 on the side for forming this side surface groove 23. A width of an installation surface of a second joining plate 41 facing the upper surface of the vertical floor joist 21, is set in the same as a distance between a starring point 24' of the inclined face 24 of the edge part of the vertical floor joist 21 and the edge of the vertical floor joist 21 on the opposite side of the starting point, or longer than the distance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a truck bed lower structure for attaching a bed to a truck chassis.

  The truck is provided with a loading platform on the rear side of which loads are loaded. The loading platform is attached to the truck chassis via a cross beam structure attached to the back surface of the floor plate, that is, a truck loading platform lower structure. This truck bed lower structure is composed of a square tube-shaped vertical joist fixed to the chassis and a square tube-shaped horizontal joist fixed to the upper surface of the vertical joist across the vertical joist, and the floor board Attached to the top.

  And in the conventional truck bed lower structure, the vertical joist is fixed to the upper surface of the chassis via a band-shaped packing material made of a synthetic resin such as vinyl chloride in order to prevent slippage with the upper surface of the chassis (for example, , See Patent Document 1).

In addition, a side groove having a C-shaped cross section that is long in the longitudinal direction of the vertical joist is formed on the side surface of the vertical joist. The operation | work attached with a board and the operation | work which attaches oil-feeding piping and a distribution line as needed can be performed easily (for example, refer patent document 2).
Japanese Patent Laid-Open No. 9-2321 Japanese Utility Model Publication No. 7-33778

  However, in the conventional truck bed bottom structure, the vertical joist is only affixed to the bottom surface flat across the width direction of the vertical joist and the flat upper surface across the width direction of the chassis with double-sided adhesive tape. The packing material is displaced due to the inertial force, centrifugal force, etc. acting on the packing material when the truck vibrates or starts / stops. As a result, the components that make up the truck bed bottom structure are excessively connected to the parts. The stress acts, causing a problem that the part is deformed or broken.

  Also, because the horizontal joist is in contact from one edge to the other edge of the top surface of the square tube-shaped vertical joist, the inertial force, centrifugal force, etc. that act on the horizontal joist when the truck vibrates or starts / stops Thus, when stress concentrates on the edge of the vertical joist, the side groove with a C-shaped cross section formed on the side surface of the vertical joist is deformed, and the bolt head cannot be fitted into this side groove, so that There arises a problem that vertical joists, horizontal joists, and chassis, and oil supply pipes and distribution lines cannot be easily attached.

  Accordingly, an object of the present invention is to provide a truck bed lower structure in which the packing material can be reliably disposed between the upper surface of the chassis and the lower surface of the vertical joists.

  Another object of the present invention is to provide a truck bed lower structure in which a vertical joist, a horizontal joist, and a chassis can be easily attached at predetermined positions.

  The truck bed lower structure according to the present invention that achieves the above object is for attaching a bed to a truck chassis.

  The lower structure of the truck bed according to the present invention is a rectangular tube-like vertical joist disposed on the upper surface of the chassis via a packing material, a first fixing means for fixing the vertical joist to the chassis, and the vertical joist crossing the vertical joist. It is composed of a rectangular tube-shaped horizontal joist disposed on the upper surface of the joist and a second fixing means for fixing the horizontal joist to the vertical joist.

  A bottom groove having a U-shaped cross section that is long in the longitudinal direction of the vertical joist is formed on the lower face of the vertical joist, and a packing material is disposed in the lower groove. Thereby, a packing material is reliably arrange | positioned between the upper surface of a chassis, and the lower surface of a vertical joist. This packing material prevents slipping of the vertical joist with respect to the upper surface of the chassis, is a belt-like thing made of synthetic resin, and can be disposed by being stuck in the lower groove of the vertical joist with an adhesive.

  The first fixing means includes a first joint plate having a side face of the vertical joist and a mounting surface facing the side face of the chassis, means for fixing the first joint plate to the side face of the chassis, and the first joint It is comprised from the 1st bolt means for fixing a board to a vertical joist.

  The means for fixing the first joining plate to the side of the chassis can be selected from known means such as bolts, screws, rivets, welding, etc., by which the first joining plate facing the side of the chassis. Is attached to the side surface of the chassis, and the first joining plate is fixed to the side surface of the chassis.

  One or a plurality of side grooves having a C-shaped cross section that are long in the longitudinal direction of the vertical joists are formed on the side faces of the vertical joists, and one end of the first bolt means is fitted into the side grooves. Thereby, the attachment surface of the first joining plate facing the side surface of the vertical joist is attached to the side surface of the vertical joist, and the first joining plate is fixed to the vertical joist.

  An inclined surface inclined downward is formed at the edge portion of the upper surface of the vertical joist on the side where the side groove is formed. Thereby, since the lower surface of the horizontal joist does not contact the edge portion of the upper surface of the vertical joist, the side groove of the vertical joist is not deformed by the load. Such an inclined surface may be inclined substantially straight downward or may be inclined downward in a round shape.

  Preferably, one or more upper surface grooves having a C-shaped cross section that are long in the longitudinal direction of the vertical joists are further formed on the upper surface of the vertical joists. At this time, the first fixing means deformably, a first joint plate having a mounting surface facing the upper surface of the vertical joist and the side surface of the chassis, for fixing the first joint plate to the side surface of the chassis And a first bolt means for fixing the first joining plate to the vertical joist, and one end of the first bolt means is fitted into the upper face groove of the vertical joist.

  The second fixing means includes a second joining plate, means for fixing the second joining plate to the side surface of the horizontal joist, and means for fixing the second joining plate to the vertical joist. The

  As the second bonding plate, one having a mounting surface facing the side surface of the horizontal joist and the side surface of the vertical joist can be used. At this time, the means for fixing the second joining plate to the side surface of the horizontal joist and the means for fixing the second joining plate to the vertical joist are known means such as bolts, screws, rivets, and welding, respectively. By this known means, the mounting surface of the second joint plate facing the side surface of the horizontal joist and the side surface of the vertical joist is attached to the side surface of the horizontal joist and the side surface of the vertical joist. Is fixed to the side of the horizontal joist and the side of the vertical joist. Preferably, the means for fixing the second joining plate to the vertical joist is the second bolt means, and one end of the second bolt means is fitted in the side groove of the vertical joist.

  Moreover, you may use what has an attachment surface which faces the side surface of a horizontal joist and the upper surface of a vertical joist as this 2nd joining board. At this time, the means for fixing the second joining plate to the side surface of the horizontal joist and the means for fixing the second joining plate to the vertical joist can be selected from the above-mentioned known means, respectively. The mounting surface of the second joint plate facing the side surface of the horizontal joist and the upper surface of the vertical joist is attached to the side surface of the horizontal joist and the upper surface of the vertical joist, and the second joint plate is vertically aligned with the side surface of the horizontal joist. Fixed to the upper surface of the joist.

  Preferably, an upper surface groove having a C-shaped cross section that is long in the longitudinal direction of the vertical joists is further formed on the upper surface of the vertical joists, and at this time, the above-mentioned first having the side surfaces of the horizontal joists and the mounting surfaces facing the upper surfaces of the vertical joists The two joining plates are deformably fixed to the vertical joists by the second bolt means whose one end is inserted into the upper surface groove.

  Here, the width of the mounting surface of the second joining plate facing the upper surface of the vertical joist is the distance between the starting point of the inclined surface of the edge portion of the vertical joist and the edge of the vertical joist on the opposite side. Same or longer than this distance. Thereby, the deformation | transformation of the 2nd joining board by a load is prevented.

  Preferably, a horizontal joist having a C-shaped cross section is used, wherein the second fixing means further comprises third bolt means for fixing the lower surface of the horizontal joist to the vertical joist. One end of the third bolt means is fitted into the upper face groove of the vertical joist.

  Moreover, a hollow thing is used as this vertical joist, and at this time, a rib extending from the inner lower surface of the vertical joist to the back surface of the upper surface groove is formed inside the vertical joist. Thereby, a hollow vertical joist is reinforced.

  Since this invention is comprised as mentioned above, there exist the following effects.

  A bottom groove with a U-shaped cross section that is long in the longitudinal direction of the vertical joist is formed on the lower surface of the vertical joist, and a packing material is disposed in the lower groove so that the lower groove functions as a stopper for the packing material, and the packing material Can be reliably disposed between the upper surface of the chassis and the lower surface of the vertical joists.

  One or more side grooves having a C-shaped cross section that are long in the longitudinal direction of the vertical joists are formed on the side surfaces of the vertical joists, and one end of the first bolt means for fixing the first joining plate to the vertical joists is provided. Since it is inserted into this side groove, the mounting surface of the first joining plate facing the side face of the vertical joist can be attached to the side face of the vertical joist, without the work of making a hole in the side face of the vertical joist, Thereby, a 1st joining board can be fixed to a vertical joist by an easy simple operation. In addition, by forming a plurality of such side grooves, even if the side groove on the upper surface side of the vertical joist is deformed by a load, the side groove on the lower side is used to face the side surface of the vertical joist. The attachment surface of the first joining plate can be attached to the side surface of the vertical joist. Furthermore, since the inclined surface inclined downward is formed on the edge portion of the upper surface of the vertical joist on the side where the side groove is formed, the lower surface of the horizontal joist is not in contact with the edge portion of the upper surface of the vertical joist. The joist side groove is not deformed by the load.

  The width of the mounting surface of the second joining plate facing the upper surface of the vertical joist is equal to the distance between the starting point of the inclined surface of the edge portion of the vertical joist and the edge of the vertical joist on the opposite side, or Since the distance is longer than this distance, deformation of the second joining plate due to the load can be prevented.

  As shown in FIG. 1A, a loading platform 11 on which loads are loaded is provided inside the packing box 10. The loading platform 11 is attached to a truck chassis (indicated by reference numeral 13 in FIG. 1B) via a cross beam structure attached to the back surface of the floor plate 12, that is, a truck loading platform lower structure 20.

  1B and 2 to 5 show examples of the truck bed lower structure 20 of the present invention. As shown in the figure, the truck bed lower structure 20 of the present invention includes a rectangular tube-shaped vertical joist 21 disposed on the upper surface of the chassis 13 via a packing material 14, and a first structure for fixing the vertical joist 21 to the chassis 13. And a second fixing means 40 for fixing the horizontal joist 27 to the vertical joist 21, which is disposed on the upper surface of the vertical joist 21. Is done.

  A bottom groove 22 having a U-shaped section that is long in the longitudinal direction of the vertical joist 21 is formed on the lower surface of the vertical joist 21 (see FIGS. 6A to 6E), and the packing material 14 is disposed in the lower groove 22. The packing material 14 is for preventing the vertical joist 21 from slipping with respect to the upper surface of the chassis 13, and is a belt-shaped member made of synthetic resin. The packing material 14 is attached to the lower surface groove 22 of the vertical joist 21 with an adhesive. be able to. The lower surface groove 22 is at a depth more than half of the thickness of the packing material 14, and more than half of the upper portion of the packing material 14 is accommodated in the lower surface groove 22, and the lower portion of the packing material 14 Is exposed downward from the lower surface groove 22. Thereby, the packing material 14 is reliably arrange | positioned between the upper surface of the chassis 13, and the lower surface of the vertical joist 21.

  The first fixing means 30 includes a first joint plate 31 having a mounting surface facing the side surface of the vertical joist 21 and the side surface of the chassis 13, and means for fixing the first joint plate 31 to the side surface of the chassis 13. , And a first bolt means 32 for fixing the first joining plate 31 to the vertical joists 21.

  The means for fixing the first joining plate 31 to the side surface of the chassis 13 can be selected from known means such as bolts, screws, rivets, and welding, and the first means facing the side surface of the chassis 13 by this known means. The attachment surface of the joining plate 31 is attached to the side surface of the chassis 13, and the first joining plate 31 is fixed to the side surface of the chassis 13. In the example shown in FIG. 1B, the mounting surface of the first joining plate 31 is made of the chassis 13 by the bolt means that tightens the tip of the bolt inserted through the mounting surface of the first joining plate 31 from the side surface of the chassis 13 with a nut. The first joining plate 31 is fixed to the side surface of the chassis 13 by being attached to the side surface.

  In the illustrated example, one side groove 23 having a C-shaped cross section that is long in the longitudinal direction of the vertical joist 21 is formed on the side surface of the vertical joist 21, and one end of the first bolt means 32 is inserted into the side groove 23. Inserted. Thereby, the attachment surface of the first joining plate 31 facing the side surface of the vertical joist 21 is attached to the side surface of the vertical joist 21, and the first joining plate 31 is fixed to the vertical joist 21. 6A to 6E, a plurality of such side grooves 23 may be formed on the side surfaces of the vertical joists 21, and the number of the side grooves 23 can be selected as appropriate. Further, by forming a plurality of such side grooves 23, even if the side grooves 23 on the upper surface side of the vertical joists 21 are deformed by a load, the side grooves 23 below the The first joining plate 31 can be fixed to the chassis 13.

  An inclined surface 24 inclined downward is formed at the edge portion of the upper surface of the vertical joist 21 on the side where the side groove 23 is formed. Thereby, since the lower surface of the horizontal joist 27 does not contact the edge part of the upper surface of the vertical joist 21, the side surface groove 23 of the vertical joist 21 is not deformed by a load. Such an inclined surface 24 may be inclined substantially straight downward as shown in FIG. 7A, or may be inclined downwardly as shown in FIG. 7B. The inclination starting point 24 ′ of the inclined surface 24 may be at a position where the side groove 23 does not deform when a load is applied to the edge portion of the vertical joist 21. It is in the vicinity, and is preferably directly above the bottom surface of the side groove 23 or on the inner side (center side of the top surface of the vertical joist 21).

  On the upper surface of the vertical joist 21, one or more upper surface grooves 25 having a C-shaped cross section that are long in the longitudinal direction of the vertical joist 21 are further formed. At this time, as shown in FIGS. 4A and B and FIGS. 5A and B, the first fixing means 30 is a front L-shaped first joint having a mounting surface facing the upper surface of the vertical joist 21 and the side surface of the chassis 13. A plate 31, means for fixing the first joining plate 31 to the side surface of the chassis 13 (this means can be selected from the above-mentioned known means), and the first joining plate 31 is fixed to the vertical joists 21. For this purpose, one end (bolt head) of the first bolt means 32 is fitted into the upper surface groove 25 of the vertical joist 31. A plurality of such upper surface grooves 25 may be formed on the upper surface of the vertical joists 21 as shown in FIGS. 6A to 6E, and the number of the upper surface grooves 25 can be selected as appropriate.

  The second fixing means 40 fixes the second bonding plate 41, means for fixing the second bonding plate 41 to the side surface of the horizontal joist 27, and fixes the second bonding plate 41 to the vertical joist 21. It is comprised from the means for.

  As shown in FIGS. 3A and 3B and FIGS. 5A and 5B, a flat L-shaped plate having a mounting surface facing the side surface of the horizontal joist 27 and the side surface of the vertical joist 21 can be used. At this time, the means for fixing the plane L-shaped second joining plate 41 to the side surface of the horizontal joist 27 and the means for fixing the second joining plate 41 to the vertical joist 21 are a bolt and a screw, respectively. , Rivets, welding, and other known means. By this known means, the mounting surface of the second joining plate 41 facing the side surface of the horizontal joist 27 and the side surface of the vertical joist 21 is Attached to the side surface of the joist 21, the second joining plate 41 is fixed to the side surface of the horizontal joist 27 and the side surface of the vertical joist 21. Preferably, the means for fixing the second joining plate 41 to the vertical joists 21 is the second bolt means 42 as shown in FIGS. 3A and 3B and FIGS. 5A and 5B, and this second bolt means. One end (bolt head) of 42 is fitted into the side groove 23 of the vertical joist 21.

  Further, as the second joining plate 41, as shown in FIGS. 2A and 2B and FIGS. 4A and B, a side face L-shaped member having a mounting surface facing the side surface of the horizontal joist 27 and the upper surface of the vertical joist 21 is used. May be. At this time, the means for fixing the L-shaped second joining plate 41 to the side surface of the horizontal joist 27 and the means for fixing the second joining plate 41 to the vertical joist 21 are respectively known as described above. By this known means, the attachment surface of the second joining plate 41 facing the side surface of the horizontal joist 27 and the upper surface of the vertical joist 21 is attached to the side surface of the horizontal joist 27 and the upper surface of the vertical joist 21. Thus, the second joining plate 41 is fixed to the side surface of the horizontal joist 27 and the upper surface of the vertical joist 21.

  Preferably, as shown in the drawing, an upper surface groove 25 having a C-shaped cross section that is long in the longitudinal direction of the vertical joist 21 is further formed on the upper surface of the vertical joist 21 (in the illustrated example, one upper surface groove 25 is formed. 6A to 6E, a plurality of them may be formed). At this time, the side surface L-shaped first side having a mounting surface facing the side surface of the horizontal joist 27 and the upper surface of the vertical joist 21 is provided. The second joining plate 41 is fixed to the vertical joist 21 by second bolt means 42 (the bolt head is inserted into the upper surface groove) with one end inserted into the upper surface groove 25.

  Here, as shown in FIG. 8, the width of the mounting surface of the second joining plate 41 facing the upper surface of the vertical joist 21 is the start point 24 ′ of the inclined surface 24 of the edge portion of the vertical joist 21, It is the same as or longer than the distance between the opposite vertical joists 21 edges. Thereby, the deformation | transformation of the 2nd joining board 41 by a load is prevented, and the stress which acts on the upper surface of the vertical joist 21 can be disperse | distributed.

  Preferably, as the horizontal joist 27, as shown in FIG. 2 to FIG. 5, one having a C-shaped cross section is used. At this time, the second fixing means 40 has the lower face of the horizontal joist 27 as the vertical joist 21. The third bolt means 43 is further configured to be fixed to the upper end groove 25 of the vertical joist 21. One end (the head of the bolt) of the third bolt means 43 is fitted into the upper surface groove 25 of the vertical joist 21.

  Moreover, as shown in FIG. 6A-FIG. 6E, a hollow thing is used as the vertical joist 21, and at this time, as shown in FIG. A rib 26 is formed across the back surface of the upper surface groove 25. Thereby, the hollow vertical joist 21 is reinforced.

FIG. 1A is a partially cutaway perspective view of a truck's cargo box, and FIG. 1B is a partial perspective view of a truck bed lower structure according to the present invention. 2A is a front view of the truck bed bottom structure of FIG. 1B, and FIG. 2B is a side view of FIG. 1B. FIG. 3A is a front view of the lower structure of the truck bed according to the present invention, and FIG. 3B is a side view of FIG. 3A. 4A is a front view of the truck bed lower structure according to the present invention, and FIG. 4B is a side view of FIG. 4A. FIG. 5A is a front view of a truck bed bottom structure according to the present invention, and FIG. 5B is a side view of FIG. 5A. 6A to 6E are cross-sectional views of vertical joists, respectively. 7A and 7B are cross-sectional views of edge portions of the vertical joists, respectively. 8 is a cross-sectional view taken along line 8-8 in FIG. 2B.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Packing box 11 ... Loading platform 12 ... Floor board 13 ... Chassis 14 ... Packing material 20 ... Truck loading platform lower structure 21 ... Vertical joist 22 ... Lower surface groove 23 ... Side groove 24 ... inclined surface 24 '... starting point 25 of inclined surface ... upper surface groove 26 ... rib 27 ... horizontal joist 30 ... first fixing means 31 ... first One joining plate 32 ... first bolt means 40 ... second fixing means 41 ... second joining plate 42 ... second bolt means 43 ... third bolt means

Claims (16)

A truck bed bottom structure for attaching a bed to a truck chassis,
A square tube-shaped vertical joist placed on the upper surface of the chassis via a packing material,
First fixing means for fixing the vertical joists to the chassis;
A rectangular tube-shaped horizontal joist arranged on the upper surface of the vertical joist crossing the vertical joist, and a second fixing means for fixing the horizontal joist to the vertical joist,
Consisting of
A bottom groove having a U-shaped cross section that is long in the longitudinal direction of the vertical joist is formed on the lower surface of the vertical joist, and the packing material is disposed in the lower groove.
However, the lower structure of the truck bed. The truck bed substructure according to claim 1,
On the side surface of the vertical joist, one or a plurality of side grooves having a C-shaped cross section that are long in the longitudinal direction of the vertical joist are formed,
An inclined surface inclined downward is formed on the edge portion of the upper surface of the vertical joist on the side where the side groove is formed,
The first fixing means is
A first joining plate having a mounting surface facing a side surface of the vertical joist and a side surface of the chassis;
Means for fixing the first joining plate to the side surface of the chassis, and first bolt means for securing the first joining plate to the longitudinal joists, wherein the first bolt means A first bolt means, one end of which is fitted into the side groove,
Consisting of
The second fixing means is
The second joining plate,
Means for fixing the second bonding plate to the side surface of the horizontal joists, and means for fixing the second bonding plate to the vertical joists,
Consisting of,
However, the lower structure of the truck bed. The truck bed substructure according to claim 2,
The second joining plate has a mounting surface facing a side surface of the horizontal joists and an upper surface of the vertical joists,
The width of the mounting surface is the same as or longer than the distance between the starting point of the inclined surface of the vertical joist and the edge of the vertical joist on the opposite side thereof,
However, the lower structure of the truck bed. The truck bed substructure according to claim 2,
The second joining plate has a mounting surface facing the side surface of the horizontal joist and the side surface of the vertical joist,
The means for fixing the second joining plate to the vertical joists is a second bolt means, and one end of the second bolt means is fitted into the side groove.
However, the lower structure of the truck bed. The truck bed substructure according to claim 2,
On the upper surface of the vertical joists, one or a plurality of C-shaped upper surface grooves that are long in the longitudinal direction of the vertical joists are formed,
The second joining plate has a mounting surface facing a side surface of the horizontal joists and an upper surface of the vertical joists,
The means for fixing the second joining plate to the vertical joists is a second bolt means, and one end of the first bolt means is fitted into the upper surface groove,
The width of the mounting surface facing the upper surface of the vertical joist is the same as or longer than the distance between the starting point of the inclined surface of the vertical joist and the edge of the vertical joist on the opposite side,
However, the lower structure of the truck bed. The truck bed substructure according to claim 5,
The lateral joist has a C-shaped cross section,
The second fixing means is
A third bolt means for fixing the horizontal joist to the bottom joist, wherein one end of the third bolt means is fitted into the upper groove;
Further comprising
However, the lower structure of the truck bed. The truck bed substructure according to claim 5,
The vertical joists are hollow,
Inside the vertical joists, ribs extending from the inner lower surface of the vertical joists to the back surface of the upper surface groove are formed.
However, the lower structure of the truck bed. The truck bed substructure according to claim 1,
On the upper surface of the vertical joists, one or a plurality of C-shaped upper surface grooves that are long in the longitudinal direction of the vertical joists are formed,
On the side surface of the vertical joist, one or a plurality of side grooves having a C-shaped cross section that are long in the longitudinal direction of the vertical joist are formed,
An inclined surface inclined downward is formed on the edge portion of the upper surface of the vertical joist on the side where the side groove is formed,
The first fixing means is
A first joining plate having a mounting surface facing an upper surface of the vertical joists and a side surface of the chassis;
Means for fixing the first joining plate to the side surface of the chassis, and first bolt means for securing the first joining plate to the longitudinal joists, wherein the first bolt means A first bolt means, one end of which is inserted into the upper surface groove,
Consisting of
The second fixing means is
The second joining plate,
Means for fixing the second joining plate to a side surface of the horizontal joist, and means for fixing the second joining plate to the vertical joist,
Consisting of,
However, the lower structure of the truck bed. The truck bed substructure according to claim 8,
The second joining plate has a mounting surface facing a side surface of the horizontal joists and an upper surface of the vertical joists,
The means for fixing the second joining plate to the vertical joists is a second bolt means, and one end of the first bolt means is fitted into the upper surface groove,
The width of the mounting surface facing the upper surface of the vertical joist is the same as or longer than the distance between the starting point of the inclined surface of the vertical joist and the edge of the vertical joist on the opposite side,
However, the lower structure of the truck bed. The truck bed substructure according to claim 8,
The second joining plate has a mounting surface facing the side surface of the horizontal joist and the side surface of the vertical joist,
The means for fixing the second joining plate to the vertical joists is a second bolt means, and one end of the second bolt means is fitted into the side groove.
However, the lower structure of the truck bed. The truck bed substructure according to claim 8,
The lateral joist has a C-shaped cross section,
The second fixing means is
A third bolt means for fixing the horizontal joist to the bottom joist, wherein one end of the third bolt means is fitted into the upper groove;
Further comprising
However, the lower structure of the truck bed. The truck bed substructure according to claim 8,
The vertical joists are hollow,
Inside the vertical joists, ribs extending from the inner lower surface of the vertical joists to the back surface of the upper surface groove are formed.
However, the lower structure of the truck bed. The truck bed substructure according to claim 2,
The inclined surface is inclined substantially straight downward;
However, the lower structure of the truck bed. The truck bed substructure according to claim 2,
The inclined surface is round and inclined downward;
However, the lower structure of the truck bed. The truck bed substructure according to claim 8,
The inclined surface is inclined substantially straight downward;
However, the lower structure of the truck bed. The truck bed substructure according to claim 8,
The inclined surface is round and inclined downward;
However, the lower structure of the truck bed.

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