JP4199690B2 - Lorry floor structure - Google Patents

Description

  The present invention relates to a floor structure of a lorry that transports cargo such as trucks and container vehicles, and relates to a floor structure that is applied to a lorry in which a floor board on which cargo is loaded is made of wood.

  There are two types of freight cars: a container with a container attached to the loading platform and a type with a hood attached to the loading platform as needed. The container vehicle has a side wall and a ceiling wall that form a cargo compartment inside. And a wing body vehicle that opens and closes in a vertical direction, and a van body vehicle that has a double-folded door on the rear wall or side wall of a container, such as a refrigerated refrigerator.

  In any type of lorry, the floor of the loading platform extends in the width direction of the vehicle and is parallel to each other. There are cases where a metal plate such as an aluminum alloy is used as a floor board and wood such as apiton which is a main tree of a tropical forest.

  When the floor of a cargo truck bed is made of wooden board material, a drill is used to penetrate the board material from the board material to the joist board with the plate material placed on the metal horizontal joist. After tapping, a tapping screw, that is, a tapping screw is passed through the plate material and screwed to the joist. The tapping screw has a drill screw portion that is tapped by the screw itself, and as a tapping screw for fixing the floor plate to the joist, there is a countersunk tapping screw with a cross hole. The cross tapped screw with a cross hole has a flat head surface provided at the base end of the drill screw, and the flat head surface is a cross for engaging the tip of a Phillips screwdriver. A shaped engagement hole is formed. In addition to the cross-shaped engagement hole, the flat tapping screw is provided with engagement holes of various shapes such as hexagonal engagement holes in the head.

  Since the flat tapping screw has a flat head surface, when the flat tapping screw is screwed to the plate using a screwdriver, the head surface becomes flush with the plate surface. The head will form part of the floor. However, when a wooden plate is screwed to the vehicle body using a conventionally known counter-tapping screw, when the screwing is finished, a part of the wooden plate protrudes from the floor plate surface as a fibrous burr from the outer periphery of the screw head. Will do.

  For this reason, until now, after the screwing operation has been completed, it has been unavoidable to remove the burrs of the floorboard fibers made of wood that protrude with a grinder that is a grinder. In this work, the grinder was pressed against the burrs of the wood fiber to remove it, and even a skilled worker could not eliminate traces of the deburring work on the floor board surface. Therefore, when the floor board is made of a wooden board, it is difficult to improve the finishing quality of the floor surface.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a floor structure for a lorry that eliminates the need for deburring the surface of a wooden floor board of a cargo truck.

  Another object of the present invention is to provide a floor structure for a lorry in which the wooden floor board surface of the loading platform is finished to a clean surface free of burrs.

The floor structure of a lorry according to the present invention includes a plurality of metal joists constituting a loading platform of a lorry, a wooden board disposed on the joists, and the joists passing through the wooden boards. A floor structure of a lorry vehicle having a countersunk tapping screw that is screwed to the joist to fasten the wooden board, and the counter tapping screw has a screw part screwed to the joist and an outer peripheral part. together with the surface flange is provided becomes flat and a head portion that is provided integrally with the threaded portion, protruding on the rear side of the head, radially from the outer peripheral end of the tapered surface and the tapered surface diameter Forming a wood pressing surface having a directional surface, an inclined surface inclined so as to protrude radially outward on the radial surface, and a rotation direction end of the inclined surface substantially with respect to the wooden pressing surface A plurality having vertical bite surfaces Wherein the benzalkonium cuts a projection provided in the radial plane, to capture the move in the rotational direction by the part of the wooden plate is spread outward notch projection by the tapered surface on the timber pressing plane And

  According to the present invention, when the wooden board is screwed to the joist using the counter tapping screw, the plastic deformation portion of the wooden board is rotated in the rotation direction by the notch protrusion provided on the wood pressing surface on the back surface of the head of the counter tapping screw. It is possible to prevent the occurrence of burrs caused by the plastic deformation portion from the outer periphery of the head of the counter tapping screw by moving. This eliminates the need to polish the surface of the wooden board after the installation work of the counter tapping screw for fastening the wooden board to the joists, and the surface of the wooden board including the head of the counter tapping screw. Can be finished on a clean surface without burrs, and the manufacturing efficiency of the truck can be improved by reducing the manufacturing process of the truck.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a van body vehicle as an example of a cargo vehicle, and FIG. 2 is a longitudinal sectional view in a direction along the line AA in FIG. In this van body vehicle, a container 1 is mounted on a loading platform of a vehicle body, and the container 1 is disposed on a floor board 2 made of wooden board material, a front wall 3 arranged at a front end of the floor board 2, and arranged at a rear end of the floor board 2. It includes a rear wall 4 having a door 4a that can be opened and closed around a hinge in the direction, left and right side walls 5 and 6, and a ceiling wall 7 integrated with these walls 3 to 6, and a cargo compartment 8 inside. Is formed.

  As shown in FIG. 2, a plurality of vertical joists 9 extending in the running direction of the vehicle and a plurality of horizontal joists 10 extending on the vertical joists 9 and extending in the vehicle width direction are attached to the vehicle body. A cargo bed is constituted by these joists 9 and 10. The container 1 is mounted on a loading platform, and the floor board 2 made of a wooden board constituting the container 1 is fastened to the horizontal joist 10 with a flat tapping screw.

  FIG. 3 is an enlarged cross-sectional view showing a part of the floor board 2 and the horizontal joist 10. The horizontal joist 10 is directed to the main wall 10 a and the main wall 10 b from both sides thereof in a direction perpendicular to the main wall 10 a. It has side wall portions 10b and 10c that are integrally connected to the portion 10a, and is made of a steel channel material having a U-shaped cross section. It is attached to the material 9, and the other side wall portion 10c is on the upper side, and the floor plate 2 is fastened to the upper surface.

  The floor board 2 is made of apiton, which is wood. However, the floor board 2 is not limited to Apiton, and any other tree may be used as long as it is wood, and plywood may be used. An underpan 2a made of an aluminum sheet is attached to the lower surface of the floor board 2, and the water resistance of the floor board 2 is secured by the underpan 2a. As the underpan 2a, a resin sheet such as FRP may be used in addition to a metal sheet such as aluminum.

  4 is a perspective view showing a flat tapping screw 11 for fastening the floor board 2 to the side joists 10, FIG. 5A is a partially cutaway front view of FIG. 4, and FIG. 5A is an enlarged cross-sectional view taken along line BB in FIG. 5A, FIG. 5C is an enlarged cross-sectional view taken along line CC in FIG. 5B, and FIG. It is an arrow line view which follows the DD line in (C).

  The flat tapping screw 11 has a screw portion 12 and a head portion 13 integrated with a base end portion of the screw portion 12. A screw hole 12 is screwed into a prepared hole formed in advance in the horizontal joist 10 at the distal end portion of the screw portion 12. A cutting blade, that is, a drill screw portion 14 is provided for forming a screw hole by tapping at the time of stopping. The surface 15 of the head 13 is flat as shown in FIG. 5A, and the head 13 is provided with a tool engagement hole 16 for engaging a rotary tool such as an electric screwdriver. In the illustrated case, the tool engagement hole 16 is a substantially hexagonal hole, and a hexagonal member corresponding to the shape of the tool engagement hole 16 is used as the rotary tool. However, the tool engagement hole 16 may be a cross-shaped hole, and may be any other shape as long as the rotary tool is engaged.

  A flange 17 is provided on the outer peripheral portion of the head portion 13, and the screw portion side, that is, the back surface of the head portion 13 is a wood pressing surface 18. As shown in FIG. 5B, the wood pressing surface 18 is formed by a tapered surface 18a and a back surface of the flange 17, that is, a radial surface 18b. The outer peripheral edge 19 of the tapered surface 18a and the outer peripheral edge of the flange 17 are formed. Between 20 is a radial surface 18b. The flat tapping screw 11 shown in the figure has a length L of 60 mm, a nominal diameter D of the screw portion 12 is 6 mm, an outer diameter B of the head 13 is 13 mm, and a thickness dimension W of the flange 17 is 1.2. mm, and the inclination angle θ of the tapered surface 18a is 90 degrees. However, the length dimension L can be arbitrarily set, for example, 35 mm and 45 mm depending on the thickness of the floor board 2, and similarly, the outer diameter B, the nominal diameter D and the thickness dimension W are also arbitrary. Can be set to

  As shown in FIG. 5B, six cut protrusions 21 are provided on the radial surface 18b constituting the wood pressing surface 18 at predetermined intervals in the circumferential direction. However, the number of the cut protrusions 21 is not limited to six illustrated, and can be an arbitrary number. As shown in FIG. 5C, each of the cut protrusions 21 protrudes from the radial surface 18b toward the radially outer side starting from the inner peripheral side of the radial surface 18b, that is, from the wood pressing surface 18. It has the inclined surface 22 inclined in the direction to leave | separate. As shown in FIG. 5D, a biting surface 23 that is substantially perpendicular to the wood pressing surface 18 is formed at both ends of the inclined surface 22 in the circumferential direction, that is, in the rotational direction. The surface 18 and the inclined surface 22 are connected.

  Each notch protrusion 21 is a part of the floor plate 2 that is plastically deformed so as to be spread by the tapered surface 18a when the horizontal joist 10 and the wooden floor plate 2 are fastened using the counter tapping screw 11. A part of the wooden floor plate 2 plastically deformed is captured in the wood pressing surface 18 by moving in the rotational direction of the counter tapping screw 11 without being directed radially outward of the tapping screw 11. That is, the cut protrusion 21 cuts off a part of the floor plate 2 by the rotation of the head 13 and moves the cut wood in the rotation direction without directing the cut wood outward in the radial direction of the head 13. Will be captured. Further, the wood that has not been cut is also plastically deformed in the rotational direction and taken into the wood pressing surface 18 without going outward in the radial direction.

  In order to fasten the floor board 2 to the horizontal joist 10 using the flat tapping screw 11, the floor board 2 is disposed on the horizontal joist 10 as shown in FIG. Next, as shown in FIG. 3 (A), pilot holes 24 and 25 are drilled in the floor board 2 and the side wall 10c of the horizontal joist 10 using an electric drill (not shown). The inner diameters of the pilot holes 24 and 25 are set to be smaller than the nominal diameter of the thread portion 12 of the counter tapping screw 11.

  After the prepared holes 24 and 25 are drilled, the flat tapping screw 11 shown in FIG. 4 is screwed to the side wall 10c of the horizontal joist 10 from the surface side of the floor board 2 with a rotary tool. In that case, first, the screw part 12 of the flat tapping screw 11 is screwed into the prepared hole 24 of the floor plate 2 and is screwed into the floor plate 2. When the screwing progresses and the tip of the screw portion 12 reaches the side wall portion 10c, the counter tapping screw 11 is cut into the metal horizontal joist 10 by the drill screw portion 14 by cutting a part of the lower hole 25, that is, a screw hole. It is screwed to the floor board 2 and the side joists 10 while processing.

  In the final stage of screwing, the timber pressing surface 18 on the back side of the head 13 comes into contact with the timber floor plate 2, and the edge on the floor plate surface side of the prepared hole 24 is radially outside by the tapered surface 18 a. In this case, the cut protrusion 21 is plastically deformed so as to bite into the wood fibers constituting the floor board 2 and move in the rotational direction by the rotation of the head 13, so that it is plastically deformed. Therefore, the wood fiber is prevented from protruding as a burr from the outside of the head 13 in the radial direction. Further, a part of the floor board 2 is cut by the cut protrusions 21, but the cut part also receives a force that moves in the rotation direction, and the head 13 and the floor board 2 protrude outside as a burr. Absent. Therefore, even if the screwing operation of the counter tapping screw 11 is completed, no burrs of wood protrude from the outer periphery of the head 13 of the counter tapping screw 11 on the surface of the floor plate 2, so that all the counter tapping screws 11 are Finishing processing for removing burrs protruding from the surface of the floor plate 2 after screwing becomes unnecessary.

  FIG. 6 is a cross-sectional view showing, as a comparative example, a case where the floor plate 2 is screwed to the horizontal joist 10 using a conventional flat tapping screw 11a. In the case shown in FIG. 6, the floor plate 2 is fixed using the flat tapping screw 11a. 2 is fastened, the burr 26 protrudes from between the head 13 of the counter tapping screw 11a and the surface of the floor plate 2, and this deburring work is unavoidable, but in the floor structure of the present invention, Since generation | occurrence | production of such a burr | flash 26 is lose | eliminated, it became possible to perform the fastening operation | work of the floor board 2 in a short time.

In the case shown in FIG. 3, the floor board 2 is arranged on the horizontal joist 10, but the vertical joist 9 is arranged on the horizontal joist 10 and the floor board 2 is placed on the floor joisting screw 10. 11 may be fastened. Further, in the illustrated case, the cut protrusion 21 is provided on the radial surface 18b, but the same burr capturing effect can be achieved even if it is provided on the tapered surface 18a. That is, the cut protrusions 21 may be provided on at least one of the tapered surface 18a and the radial surface 18b.

It is a perspective view which shows the van body vehicle as an example of a truck. It is a longitudinal cross-sectional view of the direction in alignment with the AA of FIG. (A) is an expanded sectional view showing a part of a floor board and a horizontal joist in a state where a pilot hole is formed, and (B) is an enlarged sectional view showing a state where a flat tapping screw is fastened to the pilot hole. . It is a perspective view which shows the flat tapping screw for fastening a floor board to a horizontal joist. (A) is a partially cutaway front view of FIG. 4, (B) is an enlarged cross-sectional view along the line BB in FIG. 5 (A), and (C) is a cross-sectional view of FIG. It is an expanded sectional view which follows a C line, and (D) is an arrow line view which follows a DD line in Drawing 5 (C). It is sectional drawing which shows the case where the floor board is screwed to a horizontal root material using the conventional tapping screw as a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2 Floor board 2a Underpan 3 Front wall 4 Rear wall 5,6 Side wall 7 Ceiling wall 8 Cargo compartment 9 Vertical joist 10 Horizontal joist 11 Countersunk tapping screw 12 Screw part 13 Head 14 Drill screw part 15 Surface 16 Tool staff Joint hole 17 Flange 18 Wood pressing surface 18a Tapered surface 18b Radial surface 19, 20 Outer peripheral edge 21 Cutting protrusion 22 Inclined surface 23 Biting surface 24, 25 Pilot hole

Claims (1)

A plurality of metal joists constituting a loading platform of a truck, a wooden board disposed on the joists, and screwed to the joists through the wooden boards, the wooden boards are A floor structure of a truck having a counter tapping screw fastened to a joist,
The countersunk tapping screw has a threaded portion which is screwed, and a head portion that is provided integrally with the threaded portion with the surface a flange is provided on the outer peripheral portion becomes flat on the joists material,
On the back side of the head, a wood pressing surface having a tapered surface and a radial surface protruding radially from the outer peripheral end of the tapered surface is formed,
A plurality of incisions having an inclined surface inclined so as to protrude radially outward from the radial surface, and a biting surface substantially perpendicular to the wood pressing surface at an end in a rotational direction of the inclined surface. Protrusions are provided on the radial surface,
Floor structure of freight vehicles, wherein the benzalkonium be captured a portion of the wooden board which is spread outwardly the timber pressing plane is moved in the rotational direction by the notch projection by the tapered surface.

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