JP5570000B2 - Free access floor panel - Google Patents

Description

  The present invention relates to a free access floor panel that forms a floor surface of a free access floor laid on a floor of a room such as a clean room or a computer room.

  11 is a bottom view showing a conventional free access floor panel 2 (hereinafter sometimes referred to as panel 2), and FIG. 12 is a cross-sectional view of the panel 2 shown in FIG. (For example, see Patent Document 1).

  This panel 2 is used with the posture shown in FIG. 12 reversed in the vertical direction, and maintains a state where it is horizontally supported at a predetermined height by a support leg (not shown), such as a clean room or a computer room. Are laid side by side to form a floor surface. This forms a free access floor through which piping and wiring can pass through the space between the panel 2 and the underlying concrete floor surface below the panel 2.

  As shown in FIGS. 11 and 12, the conventional panel 2 includes a panel body 12 and a reinforcing plate member 14. The panel body 12 of the conventional panel 2 is a die-cast product made of an aluminum alloy, and includes a flat plate portion 4 forming a floor surface of a free access floor, and a back surface side of the flat plate portion 4 (in FIG. 11). In FIG. 12, the plurality of ribs 6 are integrally formed on the front side in the direction perpendicular to the paper surface and on the upper side in FIG. Each of the plurality of ribs 6 is formed so as to extend along the planar shape of the flat plate portion 4, and is arranged in a lattice shape as shown in FIG.

  Further, the reinforcing plate member 14 of the conventional panel 2 is formed by cutting a square shape from a plate-shaped material made of an aluminum alloy, and the surface on the panel body 12 side is formed of a plurality of ribs 6. Each tip surface is contacted and joined to the tip surfaces of the plurality of ribs 6 by bonding or welding.

  In the conventional panel 2, the plurality of ribs 6 of the panel main body 12 and the reinforcing plate member 14 are joined by friction stir welding means as will be described later. May be.

  Here, for example, as described in Patent Documents 2 and 3, the friction stir welding means includes a substantially cylindrical portion and a screw rod-like projection portion (hereinafter referred to as a probe) that protrudes on the axis from the tip surface thereof. A tool having a shape having a shape of `` a) '' and rotating the tool around the axis while pressing substantially perpendicularly to the joining portion between the joining members or the vicinity thereof, thereby softening the joining member to the level before liquefaction with frictional heat, A joining means for solidifying the probe by entering the softened joining member into the softened joining member to cause plastic flow by agitating action, and by integrating the metal structure of the joining portion of the joining members by mixing. Say.

  When the plurality of ribs 6 and the reinforcing plate member 14 of the panel body 12 of the conventional panel 2 are joined by friction stir welding means, the panel 2 is as shown in FIG. Further, the vertical direction of the front and back surfaces is in a state opposite to that in use (a state in which the reinforcing plate member 14 is disposed on the upper side of the panel body 12), and friction stir welding is performed (not shown). It is fixed on the processing table of the apparatus.

Then, rotation of a device (not shown) that performs friction stir welding at a position corresponding to the rib 6 existing on the back side (panel main body portion 12 side) of the reinforcing plate member 14 on the side opposite to the panel main body portion 12. The probe of the tool to be pressed is pressed from above, the probe softens the reinforcing plate member 14 by frictional heat and sinks toward the rib 6, and the tip of the rib 6 (the tip in the height direction; the same applies hereinafter). Until the boundary portion is softened, the probe is relatively moved in the direction in which the rib 6 extends horizontally, whereby friction stir welding is performed.
Japanese Utility Model Publication No. 63-94241 Japanese Patent No. 2712838 Japanese Patent No. 2792233

  However, in the conventional free access floor panel 2 as described above, when the rib 6 of the panel body 12 and the reinforcing plate member 14 are to be joined by the friction stir welding means, the reinforcing plate member 14 is When the thickness of the reinforcing plate member 14 is large, it takes time for the softening due to frictional heat to gradually expand from the position where the probe of a device (not shown) that performs friction stir welding on the reinforcing plate member 14 is pressed. Therefore, since the time until the tip of the rib 6 on the side opposite to the probe of the reinforcing plate member 14 starts to soften becomes longer, there is a problem that the time for joining by the friction stir welding means becomes longer. In this case, there is a problem that poor bonding is likely to occur.

  Therefore, in view of the above problems, the present invention can reduce the time for joining by the friction stir welding means used for joining the tip of the rib of the panel main body part and the reinforcing plate member, and the joining failure is reduced. It is an object of the present invention to provide a panel for a free access floor that can be reliably joined without being generated.

In order to solve the above problems, a panel for a free access floor according to the present invention is:
A panel body portion having a flat plate portion and a plurality of ribs integrally formed on the back side of the flat plate portion;
A reinforcing plate member that is joined to the tip portions of the plurality of ribs and has an opening formed in the center thereof in the thickness direction ;
Wherein the one of the tip portions of the plurality of ribs, and the horizontal contact surface in contact with each other with said plate-side surface of the reinforcing plate member thinner than the thickness of the thickness of the rib, the height direction of the rib In the above-described horizontal contact surface, a protrusion projecting by a height of the same dimension as the thickness of the reinforcing plate member is formed on the side opposite to the flat plate portion ,
The protrusions at the tip ends of the plurality of ribs formed at positions corresponding to the edge portions of the openings of the reinforcing plate member are the outer periphery of a frame formed by connecting both ends of the plurality of protrusions. It is formed at the end on the inner peripheral side in the thickness direction of each of the plurality of ribs so that the opening is fitted in contact with the surface,
The protrusions at the tips of the plurality of ribs formed at positions on the outermost peripheral side of the panel main body over the entire range in the length direction of the side portions are in the length direction of each of the plurality of protrusions. Are formed at the end portions on the outer peripheral side in the thickness direction of each of the plurality of ribs so that the outer peripheral surface of the reinforcing plate member is fitted inside the frame formed by connecting the end portions of
The reinforcing plate member and the protrusion are joined by friction stir welding means.

Further, the panel for a free access floor according to the present invention is formed on the outermost peripheral side of the panel body between a position over the entire range in the length direction of the side portion and a position corresponding to the edge portion of the opening. The protrusions at the front ends of the plurality of ribs are fitted into grooves formed in the reinforcing plate member, and the thickness of each of the plurality of ribs is smaller than the thickness of the ribs. It is characterized by being formed at the center in the thickness direction.

According to such a panel for a free access floor according to the present invention,
A panel body portion having a flat plate portion and a plurality of ribs integrally formed on the back side of the flat plate portion;
A reinforcing plate member joined to tip portions of the plurality of ribs,
Protrusions are formed on all or any of the plurality of ribs,
By the fact that the reinforcing plate member and the protrusion are joined by friction stir welding means,
It is possible to shorten the time for joining by the friction stir welding means used for joining the tip end portion of the rib and the reinforcing plate member, and it is possible to reliably join without causing poor bonding.

Moreover, according to the panel for free access floors according to the present invention,
By forming the protrusion on one end in the thickness direction of the rib,
It is possible to prevent the time for joining from becoming long during the operation of joining such a protruding portion to the edge portion of the reinforcing plate member.

Moreover, according to the panel for free access floors according to the present invention,
The protrusion is formed at the center in the thickness direction of the rib,
It is possible to prevent the time for joining from becoming long in the operation of joining such a protruding part to a part other than the edge part of the reinforcing plate member.

Hereinafter, the best mode for carrying out the panel for a free access floor according to the present invention will be specifically described with reference to the drawings.
FIGS. 1 to 4 are views to be referred to for explaining the free access floor panel 20 according to the first embodiment of the present invention. The same parts as those in the prior art will be described using the same reference numerals, and overlapping description of the same parts as in the conventional art will be omitted as much as possible.

  The free access floor panel 20 (hereinafter also referred to as the panel 20) according to the present embodiment is made of an aluminum alloy, and as shown in FIGS. 1 and 2, the panel main body 22, the reinforcing plate member 24, and the like. It has.

  The panel body 22 of the panel 20 includes a flat plate portion 4 that forms the floor surface of the free access floor, and a back surface side of the flat plate portion 4 (the front side in the direction perpendicular to the paper surface in FIG. 1, in FIG. A plurality of first ribs 26 and second ribs 28 are formed integrally with a height on the upper side.

  As shown in FIG. 1, four first ribs 26 are formed so as to extend along each of the four sides of the flat plate portion 4, and the four outer circumferences thus formed form a square. It has become. Further, each of the second ribs 28 is formed so as to extend in two vertical and horizontal directions within the range of the inside of the four first ribs 26 so as to intersect with each other, and is arranged in a lattice shape as shown in FIG. ing.

  The front ends of the plurality of ribs 26 and 28 of the panel body 22 in the panel 20 and the reinforcing plate member 24 are joined to each other by the friction stir welding means. As described above, after the plurality of ribs 26 and 28 and the reinforcing plate member 24 of the panel main body portion 22 are joined to each other by the friction stir welding means, the metal structures are mixed together at such a joining portion. Therefore, in practice, it may not be possible to define the boundary line between each other, but for convenience, as shown in FIGS. 1 to 4, the ribs 26 and 28 and the reinforcing plate member 24 Assuming that there is a boundary line, such a boundary line is also indicated by a solid line or a broken line, like other normal contour lines.

  As shown in FIG. 3, the first rib 26 of the panel main body 22 in the panel 20 is provided at the tip in the height direction (vertical direction in FIG. 3), on the flat plate portion 4 side (see FIG. 3). 3), a horizontal contact surface 26 a that is in contact with the lower surface 24 a and a protrusion 26 b that protrudes on the opposite side of the flat plate portion 4 from the horizontal contact surface 26 a in the height direction of the first rib 26. Has been.

  The protrusion 26b of the first rib 26 has a thickness (dimension t2 in FIG. 3) that is thinner than the thickness of the first rib 26 (dimension t1 in FIG. 3) and has a height that is the same as the thickness of the reinforcing plate member 24. It is formed so as to protrude. Further, as shown in FIG. 1, the protrusion 26 b is formed over the entire range in the length direction of each of the first ribs 26 on the four sides of the panel body 22, and as shown in FIG. 3, the first rib 26 is formed at the end portion on the outer peripheral side (right side in the drawing) in the thickness direction of each.

  The reinforcing plate member 24 of the panel 20 is fitted inside a rectangular frame formed by connecting the end portions in the length direction of each of the protruding portions 26b. And the joining by the friction stir welding between the reinforcing plate member 24 and the first rib 26 is, as shown in FIG. 3, the boundary between the peripheral portion of the reinforcing plate member 24 and the protruding portion 26 b of the first rib 26, Alternatively, a rotating tool probe of a device (not shown) that performs friction stir welding from above in FIG. 3 is pressed downward on the reinforcing plate member 24 in the vicinity thereof in FIG.

  As shown in FIG. 4, the panel 20 has a flat plate portion 4 side of the reinforcing plate member 24 at the front end portion in the height direction (upward in FIG. 4) of the second rib 28 of the panel main body portion 22. A horizontal contact surface 28a that is in contact with the surface 24a (lower side in FIG. 4), and a protrusion 28b that protrudes on the opposite side of the flat plate portion 4 from the horizontal contact surface 28a in the height direction of the second rib 28; Is formed.

  The protruding portion 28b of the second rib 28 is formed over the entire range of the length direction of the second rib 28 (in the direction perpendicular to the paper surface in FIG. 4), and the thickness direction of the second rib 28 (FIG. 4). A thickness (dimension t4 in FIG. 4) thinner than the thickness (dimension t3 in FIG. 4) of the second rib 28 is formed at the center in the middle and the left-right direction.

  Further, such a protrusion 28 b is adapted to fit into a groove 24 b formed in the reinforcing plate member 24. The joining by the friction stir welding means between the reinforcing plate member 24 and the second rib 28 is performed at a position corresponding to the protruding portion 28b of the second rib 28 on the surface 24c opposite to the surface 24a of the reinforcing plate member 24. The probe of a rotating tool of a device (not shown) that performs friction stir welding is pressed downward from above.

  According to the free access floor panel 20 according to the first embodiment as described above, as shown in FIG. 3, the first rib 26 and the reinforcing plate member 24 of the panel body 22 are connected to the friction stir welding means. When joining, the probe of a rotating tool of a device (not shown) that performs friction stir welding can be pressed against not only the reinforcing plate member 24 but also the protrusion 26b of the first rib 26 at the same time. As a result, the tip end portion of the first rib 26 starts to soften at an early stage, so that the friction stir welding means used for joining the tip end portion of the first rib 26 of the panel main body portion 22 and the reinforcing plate member 24 is used. It is possible to reduce the time required for joining by means of bonding, and it is possible to reliably join without causing a joining failure.

  As shown in FIG. 4, when the tip of the second rib 28 of the panel body 22 and the reinforcing plate member 24 are joined by the friction stir welding means, the tip of the protrusion 28 b of the second rib 28. Since the reinforcing plate member 24 corresponding thereto is partially thinned, the portion approaches the surface 24c on the side to which the probe of the apparatus for performing friction stir welding (not shown) is pressed. The tip portion of the rib 28 starts to soften at an early stage. For this reason, it is possible to reduce the time for joining by the friction stir welding means used for joining the tip end portion of the second rib 28 of the panel main body portion 22 and the reinforcing plate member 24, and to ensure that no joint failure occurs. Can be joined.

  Next, FIGS. 5 to 8 are views referred to for describing a free access floor panel 30 (hereinafter also referred to as a panel 30) according to a second embodiment of the present invention. The same parts as those of the free access floor panel 20 according to the first embodiment will be described using the same reference numerals, and overlapping description of the same configuration will be omitted as much as possible.

  6 is a cross-sectional view taken along the line CC of the panel 30 shown in FIG. 5. The cross-sectional view taken along the line DD in FIG. 5 is also taken along the line CC shown in FIG. Since the shape is exactly the same as the shape of the sectional view, the sectional view taken along the line DD is omitted.

  As shown in FIGS. 5 and 6, the free access floor panel 30 according to the present exemplary embodiment includes a panel main body 32 and a reinforcing plate member 34. The panel main body portion 32 of the panel 30 is arranged on the back surface side of the flat plate portion 4 (the front side in the direction perpendicular to the paper surface in FIG. 5 and the upper side in FIG. 6) according to the first embodiment. A plurality of first ribs 36 and second ribs 38 corresponding to the first ribs 26 and the second ribs 28 of the access floor panel 20 are provided.

  As shown in FIG. 7, a horizontal contact surface 38a and a protrusion 38b are formed at the tip of each of the plurality of second ribs 38. The protruding portion 38b of the second rib 38 is formed at the center of the second rib 38 in the thickness direction (left and right direction in FIG. 7), and the thickness of the second rib 38 (dimension t5 in FIG. 7). The thickness is smaller (dimension t6 in FIG. 7) and protrudes by the height of the same dimension as the thickness of the reinforcing plate member 34.

  Further, as shown in FIG. 5, among the protrusions 38 b of the plurality of second ribs 38, the protrusions 38 b of the second ribs 38 formed so as to extend in the vertical direction in FIG. Each of the protrusions 38b of the second rib 38 formed continuously over the entire length range of the second rib 38 and extending in the left-right direction in FIG. Within the range of the length direction, it is divided and formed intermittently by each of a plurality of projections 38b extending in the vertical direction in FIG.

  Further, as shown in FIG. 8, the horizontal contact surfaces similar to the horizontal contact surface 38a and the protruding portion 38b of the second rib 38 described above are provided at the respective leading ends of the first ribs 36 of the panel main body 32. 36a and a protrusion 36b are formed.

  Further, as shown in FIG. 5, each protrusion 36 b of the first rib 36 extends in the vertical direction in FIG. 5, similar to the protrusion 38 b of the second rib 38 described above. Each protrusion 36b of the formed first rib 36 is continuously formed over the entire range of the length direction of the first rib 36, and each of the first ribs 36 formed to extend in the left-right direction. The protrusions 36b are intermittently formed by being divided by the protrusions 38b of the second ribs 38 extending in the vertical direction in the drawing within the range of the length direction of the first ribs 36.

  Further, as shown in FIGS. 5, 7, and 8, the reinforcing plate member 34 has a plurality of grooves 34 b into which the protrusions 36 b and 38 b formed on the ribs 36 and 38 are fitted. Is formed. As shown in FIGS. 7 and 8, each of the plurality of grooves 34b has a width dimension that is the thickness of the protrusion 36b (dimension t6 in FIG. 7) and the thickness of the protrusion 38b (FIG. 8). It is formed to have the same width as the middle dimension t8).

  Further, as shown in FIG. 5, each of the plurality of groove holes 34b is formed at a position corresponding to each of the protrusions 36b and 38b with the same length as each of the protrusions 36b and 38b. Yes. Each of the groove holes 34 b is formed so as to penetrate in the thickness direction of the reinforcing plate member 34.

  According to such a free access floor panel 30 according to the second embodiment, as shown in FIGS. 7 and 8, the front ends of the ribs 36 and 38 of the panel main body 32, the reinforcing plate member 34, Of the rotating tool of a device (not shown) that performs friction stir welding not only to the reinforcing plate member 34 but also to the protrusions 36b and 38b of the ribs 36 and 38. Since the probes can be pressed simultaneously, the tips of the ribs 36 and 38 start to soften at an early stage. For this reason, it is possible to shorten the time for joining by the friction stir welding means used for joining the tip portions of the ribs 36 and 38 of the panel main body 32 and the reinforcing plate member 34, and it is ensured that no joint failure occurs. Can be joined.

  Next, FIG.9 and FIG.10 is a figure referred in order to demonstrate the free access floor panel 40 (henceforth called the panel 40) which concerns on the 3rd Embodiment of this invention. Since this embodiment is basically in common with the first embodiment, the same parts as those of the free access floor panel 20 according to the first embodiment will be described using the same reference numerals, The overlapping description of the same configuration will be omitted as much as possible.

  As in the first embodiment, a panel 40 for a free access floor according to the present embodiment has a flat panel portion 4 and a plurality of ribs 26 and 28 as shown in FIGS. 9 and 10. 42 and a reinforcing plate member 44 are provided.

  As shown in FIG. 9, the panel main body 42 of the panel 40 is formed so as to extend in the vertical direction in the figure, and among the plurality of second ribs 28 arranged in parallel to be separated from each other in the horizontal direction. The center of two second ribs 28 formed on both sides of the center second rib 28 and a plurality of second ribs 28 formed so as to extend in the left-right direction and are arranged parallel to each other in the vertical direction. In the first embodiment, the two second ribs 28 formed on both sides of the second rib 28 are within a square range sandwiched between the two second ribs 28 facing each other. Similar to that shown in FIG. 4, the protruding portion 28 b that does not penetrate the reinforcing plate member 44 is not formed.

  Further, in the length range of each of the two second ribs 28 extending in the vertical direction and the horizontal direction of the square, a reinforcement is provided as shown in FIG. A protrusion 28 c that penetrates the plate member 44 is formed. In FIG. 9, a total of four protrusions 28c are formed in a vertical frame and a horizontal direction, and a total of four protrusions 28c are formed in a square frame shape by connecting both ends thereof.

  Each of the protrusions 28c is formed at an end portion on the inner peripheral side in the thickness direction of each of the second ribs 28 where the protrusions 28c are formed. Further, as shown in FIG. 10, each of the protrusions 28 c is formed so as to protrude in the height direction by the same height as the thickness of the reinforcing plate member 44.

  Further, as shown in FIG. 9, the panel main body 42 is formed so that the protrusions 28 b and 28 c are not formed at the tip of the second rib 28 inside the square frame formed by the four protrusions 28 c. It has become.

  Further, the reinforcing plate member 44 of the panel 40 has an opening 44d at the center thereof. The opening 44d of the reinforcing plate member 44 is adapted to be fitted to the outer periphery of the square frame formed by the four protrusions 28c of the panel main body 42.

  Also in the third embodiment, the protrusion 26b of the first rib 26 is thinner (dimension t2 in FIG. 3) than the thickness of the first rib 26 (dimension t1 in FIG. 3). The reinforcing plate member 44 is formed so as to protrude by the same height as the thickness of the reinforcing plate member 44. As shown in FIG. 9, the protrusions 26b are formed over the entire range in the length direction of each of the first ribs 26 on the four sides of the panel main body 42. As shown in FIG. It is formed at the end of each thickness direction on the outer peripheral side (left and right sides in the figure).

  For this reason, the reinforcing plate member 44 of the panel 40 is also fitted inside the square frame formed by connecting the end portions in the length direction of each of the projections 26b.

  According to the panel 40 according to the third embodiment as described above, the first rib 26 of the panel main body portion 42 and the reinforcing plate member 44 are connected to the friction stir welding means similarly to the first embodiment. When joining, the probe of a rotating tool of a device (not shown) that performs friction stir welding can be pressed against not only the reinforcing plate member 44 but also the projection 26b of the first rib 26 at the same time. As a result, the tip of the first rib 26 starts to soften at an early stage. For this reason, it is possible to reduce the time for joining by the friction stir welding means used for joining the tip end portion of the first rib 26 of the panel main body portion 42 and the reinforcing plate member 44, and to ensure that there is no joint failure. Can be joined.

  Further, according to the panel 40 according to the present embodiment, when the second rib 28 and the reinforcing plate member 44 of the panel main body 42 are joined by the friction stir welding means, as in the first embodiment. In this case, the tip end of the protrusion 28b of the second rib 28 is close to the surface 44c on the side of the reinforcing plate member 44 to which the probe of the apparatus for performing friction stir welding (not shown) is pressed, so that the second The tip portion of the rib 28 starts to soften at an early stage. For this reason, it is possible to reduce the time for joining by the friction stir welding means used for joining the tip end portion of the second rib 28 of the panel main body portion 42 and the reinforcing plate member 44, and it is ensured that no joint failure occurs. Can be joined.

  Moreover, according to the panel 40 which concerns on this Embodiment, the 2nd rib 28 of the panel main-body part 42 corresponding to the edge part of the opening part 44d of the reinforcement board member 44, and the edge part of such an opening part 44d, and , By means of friction stir welding means, not only the reinforcing plate member 44 but also the protrusions 28c of the second ribs 28, a probe of a rotating tool of a device (not shown) that performs friction stir welding is used. Since they can be pressed simultaneously, the tip of the second rib 28 starts to soften at an early stage. For this reason, it is possible to reduce the time for joining by the friction stir welding means used for joining the tip end portion of the second rib 28 of the panel main body portion 42 and the reinforcing plate member 44, and it is ensured that no joint failure occurs. Can be joined.

  In the panels 20, 30, 40 according to the first to third embodiments, the front ends of the ribs 26, 28, 36, 38 of the panel body, the reinforcing plate members 24, 34, 44, However, although it was continuously joined by the friction stir welding means along the length direction of the ribs 26, 28, 36, 38, it may be joined intermittently. Moreover, when joining intermittently in this way, each of the joining locations may be spot-like.

  Further, in the panel 30 according to the second embodiment, as shown in FIG. 5, the protrusions 36b and 38b that are formed to extend in the left-right direction in the figure are formed intermittently. However, the protrusions 36b and 38b formed so as to extend in the vertical direction may be intermittently formed in the length direction.

  Further, each of the protrusions 36b and 38b formed intermittently in this way is formed so that the length in the length direction thereof becomes extremely short. In the above, each of the intermittently formed protrusions may be made visible in a spot shape.

  Further, in the panels 20 and 40 according to the first and third embodiments, the protrusions are similar to the protrusions 36b and 38b formed intermittently of the panel 30 according to the second embodiment. Each of the portions 26b, 28b, 28c may be formed intermittently in the length direction, and further, each of the protrusions thus formed intermittently may be formed in the length direction. Although not shown, each of the intermittently formed protrusions can be visually recognized in the form of a spot on the bottom view of the panels 20 and 40. It may be made like.

  Further, in the panels 20, 30, and 40 according to the first to third embodiments, the ribs 26, 28, 36, and 38 of the panel body are formed so as to be arranged in a lattice pattern. Alternatively, it may be formed so as to have another arrangement state different from the lattice arrangement.

  Further, in the panel 20 according to the first embodiment, the protrusions 26b are formed over the entire lengths of the first ribs 26 of the panel body 22, and the second ribs 28 are respectively formed. Although the case where the projection 28b is formed over the entire length has been described in combination, only one portion of either or both of the projections 26b and 28b may be formed. Good. The same applies to other embodiments.

  Further, in the panel 20 according to the first embodiment, the protruding height of the protruding portion 26b is set to be the thickness of the reinforcing plate member 24. However, the thickness of the reinforcing plate member 24 is It may be slightly higher than the minute or slightly lower. The same applies to the protrusions 36b and 38b of the panel 30 according to the second embodiment and the protrusions 26b and 28c of the panel 40 according to the third embodiment.

  Further, the panels 20, 30, and 40 according to the first to third embodiments are similar to the conventional panel 2, and the panel main body portions 22, 32, and 42 are die-cast products made of aluminum, and are reinforced. Since the plate members 24, 34, 44 are formed by cutting from a plate-shaped material made of aluminum, the panel body portions 22, 32, 42 and the reinforcing plate members 24, 34, 44 are made of strict materials ( Although the metal composition is different, for example, the reinforcing plate members 24, 34, and 44 may be die cast products so that the materials of each other may be made common.

  Conversely, the panel body portions 22, 32, and the reinforcing plate members 24, 34, and 44 are formed of different materials as long as they can be joined to each other by the friction stir welding means. Also good.

  In the first to third embodiments, the case where the present invention is applied to each of the free access floor panels 20, 30, 40 according to those embodiments has been described. In the case of free access floor panels other than the panels 20, 30, 40 according to the third embodiment, when the panel body and the reinforcing plate member are joined by the friction stir welding means, the present invention is used. It goes without saying that it can be applied.

It is a bottom view which shows the panel 20 for free access floors concerning the 1st Embodiment of this invention. It is a BB arrow directional cross-sectional view of the panel 20 for free access floors shown in FIG. It is a partial expanded sectional view which shows the right end part of the panel 20 for free access floors shown in FIG. FIG. 3 is a partial enlarged cross-sectional view showing a peripheral portion of a second rib 28 of the free access floor panel 20 shown in FIG. 2. It is a bottom view which shows the panel 30 for free access floors concerning the 2nd Embodiment of this invention. It is CC sectional view taken on the line of the free access floor panel 30 shown in FIG. It is a partial expanded sectional view which shows the peripheral part of the 2nd rib 38 of the panel 30 for free access floors shown in FIG. It is a partial expanded sectional view which shows the peripheral part of the 1st rib 36 of the panel 30 for free access floors shown in FIG. It is a bottom view which shows the panel 40 for free access floors concerning the 3rd Embodiment of this invention. It is the EE arrow directional cross-sectional view of the panel 40 for free access floors shown in FIG. It is a bottom view which shows the conventional panel 2 for free access floors. It is AA arrow sectional drawing of the conventional panel 2 for free access floors shown in FIG.

Explanation of symbols

2 Panel for Free Access Floor 4 Flat Plate 6 Rib 12 Panel Body 14 Reinforcement Plate Member 20 Free Access Floor Panel 22 Panel Body 24 Reinforcement Plate Member 24a Surface 24b Groove 24c Surface 26 First Rib 26a Horizontal Contact Surface 26b Projection 28 First rib 28a Horizontal contact surface 28b, 28c Projection 30 Panel for free access floor 32 Panel body 34 Reinforcement plate member 34b Groove hole 36 First rib 36a Horizontal contact surface 36b Projection 38 Second rib 38a Horizontal contact surface 38b Protrusion 40 Free access floor panel 42 Panel body 44 Reinforcement plate member 44c Surface 44d Opening

Claims (2)

A panel body portion having a flat plate portion and a plurality of ribs integrally formed on the back side of the flat plate portion;
A reinforcing plate member that is joined to the tip portions of the plurality of ribs and has an opening formed in the center thereof in the thickness direction ;
Wherein the one of the tip portions of the plurality of ribs, and the horizontal contact surface in contact with each other with said plate-side surface of the reinforcing plate member thinner than the thickness of the thickness of the rib, the height direction of the rib In the above-described horizontal contact surface, a protrusion projecting by a height of the same dimension as the thickness of the reinforcing plate member is formed on the side opposite to the flat plate portion ,
The protrusions at the tip ends of the plurality of ribs formed at positions corresponding to the edge portions of the openings of the reinforcing plate member are the outer periphery of a frame formed by connecting both ends of the plurality of protrusions. It is formed at the end on the inner peripheral side in the thickness direction of each of the plurality of ribs so that the opening is fitted in contact with the surface,
The protrusions at the tips of the plurality of ribs formed at positions on the outermost peripheral side of the panel main body over the entire range in the length direction of the side portions are in the length direction of each of the plurality of protrusions. Are formed at the end portions on the outer peripheral side in the thickness direction of each of the plurality of ribs so that the outer peripheral surface of the reinforcing plate member is fitted inside the frame formed by connecting the end portions of
A panel for a free access floor, wherein the reinforcing plate member and the protrusion are joined by friction stir welding means. The protrusions at the tip end portions of the plurality of ribs formed between the position on the outermost peripheral side of the panel main body and the position over the entire range in the length direction of the side portion and the position corresponding to the edge portion of the opening. parts are fitted in a groove hole formed in said reinforcing plate member, as its thickness is thinner than the thickness of the ribs, that are formed in the central portion in the thickness direction of each of the plurality of ribs The panel for a free access floor according to claim 1, wherein the panel is a free access floor.

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