JP5608536B2 - Inner frame for floor opening structure - Google Patents

Description

  The present invention relates to an inner frame used for a floor opening structure in applications such as underfloor inspection and underfloor storage.

  2. Description of the Related Art Conventionally, an opening provided in a floor for use such as underfloor inspection and underfloor storage and a frame member attached to a cover plate that closes the opening are known. The frame member includes an outer frame that is mounted along the periphery of the opening, and an inner frame that has a shape fitted to the outer frame and is mounted along the periphery of the lid plate. The inner frame includes a plurality of corner members attached to corner portions of the lid plate and a plurality of frame members attached to edge portions of the lid plate located between adjacent corner portions and connected to the corner members. (For example, refer to Patent Documents 1 and 2).

JP-A-9-310479 JP 2010-116738 A

  By the way, the cover plate to which the inner frame is attached is repeatedly attached and detached when inspecting under the floor or using the storage under the floor. Therefore, the inner frame needs to have stability that is unlikely to cause displacement and rattling with respect to the cover plate even when the attachment and detachment is repeated. Moreover, it is not preferable that the size of the inner frame is increased from the viewpoint of suppressing cost increase such as material cost and transportation cost and effective use of the underfloor space.

  Therefore, the present invention has been made in view of such a point, and the object of the present invention is for a floor opening structure having excellent stability after being attached to a cover plate while suppressing an increase in size. It is to provide an inner frame.

  The inner frame for the floor opening structure of the present invention has a shape that fits to the outer frame that is mounted along the periphery of the floor opening, and along the periphery of the polygonal lid plate that closes the opening. Installed. The inner frame has a plurality of corner members attached to corner portions of the lid plate and a plurality of frame members attached to edge portions of the lid plate located between adjacent corner portions and connected to the corner members. And.

  Each corner member includes a corner side portion covering the side surface of the corner portion, a corner lower portion connecting to the lower end of the corner side portion and covering a lower surface of the corner portion, and an upper surface of the corner portion connecting to the upper end of the corner side portion. With an upper corner covering. Each frame member includes a frame side portion covering the side surface of the edge portion, a frame lower portion connecting to the lower end of the frame side portion and covering the lower surface of the edge portion, and an upper surface of the edge portion connected to the upper end of the frame side portion. And an upper part of the covering frame.

  Each corner member further includes a first protrusion and a second protrusion. The first projecting portion projects from the corner side portion along the inner side surface of the frame side portion in the longitudinal direction of the frame member. The second projecting portion projects from the corner lower portion along the upper surface of the frame lower portion in the longitudinal direction.

  Each frame member further includes an extending portion and a groove portion. The extension portion is connected to at least one of the frame side portion, the frame lower portion, and the frame upper portion, and has a facing surface that faces the inner surface of the frame side portion, and between the facing surface and the inner surface. The first protrusion is sandwiched. The groove portion is provided on the upper surface of the lower portion of the frame, extends in the longitudinal direction, and has a bottom surface on which the second protruding portion is placed.

  The extending portion restricts the movement of the first protrusion in the width direction orthogonal to the longitudinal direction of the frame member. When the corner member and the frame member are attached to the lid plate, the groove portion includes the second projecting portion between the bottom surface of the groove portion and the lower surface of the lid plate, and the groove portion 2 The movement of the protrusion is restricted.

  In this configuration, as described below, the size of the inner frame is suppressed from increasing, and the stability after the inner frame is attached to the lid plate is also excellent.

  In this configuration, the corner member and the frame member are engaged at two locations, that is, the side portion (corner side portion and frame side portion) and the lower portion (corner lower portion and frame lower portion). Compared to the case where only one of the part and the lower part is engaged, the mounting state can be stably maintained with respect to the load applied to the inner frame from various directions.

  Specifically, in the side portion, by providing an extending portion having an opposing surface facing the inner side surface of the frame side portion, the first protruding portion is held by the frame side portion and the extending portion. Adopted. Thereby, the movement of the 1st protrusion part to the said width direction is controlled. On the other hand, in the lower part, a groove part is provided in the lower part of the frame, and the second projecting part placed on the bottom surface of the groove part is sandwiched between the bottom surface and the lower surface of the lid plate. When the corner member and the frame member are mounted on the lid plate, the lower portion of the frame and the second projecting portion are located directly below the lid plate, so that the weight of the lid plate is always applied to the lower portion of the frame and the second projecting portion. become. Thereby, the movement of the 2nd protrusion part to an up-down direction is effectively controlled by a cover plate and a groove part.

  Here, if a configuration is adopted in which the second protrusion is held in the lower portion in the same manner as the side engagement structure, it is inevitable that the vertical dimension of the lower portion of the frame is larger than that in the present configuration. That is, in the lower part of the present configuration, the movement of the second protrusion is regulated using the groove and the cover plate, so that a groove having a depth similar to the thickness of the second protrusion is provided in the lower part of the frame. It is only necessary to prevent the vertical dimension (thickness) of the lower part of the frame from increasing. Thereby, the material cost concerning an inner frame and transportation cost can be reduced. In addition, since the increase in the thickness of the lower part of the frame is suppressed, the area below the lower surface of the cover plate, that is, the underfloor space can be effectively used.

  Further, in the inner frame for the floor opening structure, the groove portion further includes a pair of upstanding surfaces that rise upward from both sides of the bottom surface, and the second projecting portion is sandwiched between the upstanding surfaces. It is preferable that the movement of the second projecting portion in the width direction is restricted.

  In this configuration, since the movement of the second projecting portion placed on the bottom surface of the groove portion in the width direction is also restricted by the pair of standing surfaces of the groove portion, the connection state between the corner member and the frame member is more stable.

  Moreover, in the inner frame for the floor opening structure, each corner member has a third projecting portion that projects from the upper corner portion along the upper surface of the upper frame portion in the longitudinal direction and covers a part of the upper surface of the upper frame portion. In this case, it is preferable that the lower surface of the third protrusion is connected to the lower surface of the upper corner portion through a step surface with which the end surface in the longitudinal direction of the upper portion of the frame can come into contact. Is preferred.

  In this configuration, since the third protrusion of the corner member covers a part of the upper surface of the upper part of the frame member, there is a variation in the dimensions of the corner member and the frame member, and there is a slight difference between the corner member and the frame member. Even when a gap is generated, such a gap is covered by the third protrusion. Therefore, it is possible to avoid exposing the gap as described above to the upper part of the inner frame, so that the aesthetics can be improved and the entry of foreign matter from the gap can be suppressed. Further, the provision of the step surface facilitates the positioning of the corner member and the frame member.

  Further, in the inner frame for the floor opening structure, the lower portion of the frame is connected to a lower end of the side portion of the frame and extends in the width direction, and further extends in the width direction from the base end region. It is preferable to have a tip region having a thickness smaller than that of the region. In this case, the groove portion is provided in the base region, and the lid plate and the frame member are provided in the tip region. It is preferable that a screw insertion portion for inserting a screw member for fixing the bottom end region from below is provided, and that the lower surface of the distal end region is located above the lower surface of the proximal end region.

  In this configuration, the proximal end region is located between the distal end region and the lower end of the frame side portion. That is, the screw insertion portion provided in the distal end region and the lower end of the frame side portion are positioned on both sides in the width direction of the groove portion provided in the proximal end region. Therefore, in a state where the frame member is fixed to the lid plate by the screw member, the groove portion and the second projecting portion placed in the groove portion are pressed (upward) from both sides in the width direction to the lower surface side of the lid plate. be able to. Thereby, since the movement of the 2nd projection part can be controlled more effectively, the connection state of a corner member and a frame member is further stabilized.

  Further, in the inner frame for the floor opening structure, the upper surface of the tip region is in contact with the lower surface of the lid plate, extends in the longitudinal direction, and is provided with a pair of contact surfaces spaced apart from each other; A packing groove is formed between the contact surfaces, recessed downward from the contact surface, and extending along the longitudinal direction. The screw insertion portion is formed in the packing region in the tip region. It is preferable to be provided in the region where the groove portion is formed.

  In this configuration, by arranging packing in the packing groove and fixing the frame member to the cover plate by the screw member, the airtightness between the cover plate and the frame member can be enhanced. Moreover, since the groove part for packing is located between a pair of contact surfaces, it can suppress that a packing shifts in the said width direction. Further, since the screw insertion portion is provided in the region where the packing groove is formed, the frame member is fixed to the cover plate in a state where the screw member penetrates the packing. Thereby, position shift of packing can be controlled more effectively.

  The first protrusion has a flat shape in which the dimension in the width direction is smaller than the dimension in the vertical direction, and has a wedge shape in which the dimension in the width direction gradually decreases or gradually increases from the upper end toward the lower end. In this case, the region between the facing surface and the inner surface sandwiching the first protrusion has a wedge shape that follows the shape of the first protrusion. Is preferred.

  In this configuration, since the shape of the first protrusion and the region into which the first protrusion is inserted is a wedge shape as described above, the upward movement or the downward movement of the first protrusion can be restricted.

  As described above, according to the present invention, the stability after the inner frame is attached to the lid plate is excellent while suppressing the increase in the size of the inner frame.

(A) shows the state which attached the inner frame for floor opening structures concerning one Embodiment of this invention along the periphery of a cover board, and fitted to the outer frame attached along the periphery of an underfloor inspection port. It is a top view, (B) is the IB-IB sectional view taken on the line of (A). It is sectional drawing to which the principal part of FIG. 1 (B) was expanded. (A) is the perspective view which looked at the corner member of the said inner frame for floor opening structures from diagonally upward, (B) and (C) are the perspective views which show a state when connecting a frame member to this corner member FIG. (A) is the perspective view which looked at the said corner member from diagonally downward, (B) And (C) is a perspective view which shows a state when a frame member is connected with this corner member. (A) is a top view which shows the said corner member, (B) is a side view which shows this corner member, (C) is a front view which shows the said corner member. It is sectional drawing which shows the said frame member. (A) is a top view which shows the corner member of the said outer frame, (B) is a side view which shows this corner member, (C) is a front view which shows the said corner member. It is sectional drawing which shows the frame member of the said outer frame.

  Hereinafter, an inner frame 11 for a floor opening structure according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1A and 1B, the inner frame 11 of the present embodiment is fitted to an outer frame 71 mounted along the periphery of a rectangular opening 92 provided in the flooring 91. It has a shape to The inner frame 11 is attached along the periphery of a rectangular lid plate 81 that closes the opening 92.

  As shown in FIG. 2, the flooring 91 has a three-layer structure in which three plate-like members 91a, 91b, and 91c are laminated, and is formed on the upper surfaces of a plurality of base materials 94 arranged at intervals. It is placed. The opening 92 is, for example, a rectangular or square hole having a side of about several tens of centimeters. As shown in FIG. 1B, a part of the base material 94 is disposed along the periphery of the opening 92.

  The side surface 941 of the base material 94 disposed along the periphery of the opening 92 is substantially at the same position as the inner peripheral surface of the opening 92 (the end surface of the floor material 91) in plan view. An outer frame support 95 to which the outer frame 71 is fixed is attached to the side surface 941 of the base material 94. As shown in FIGS. 1B and 2, the outer frame support 95 is located below the periphery of the cover plate 81 in plan view, and between the periphery of the cover plate 81 and the outer frame support 95. A part of the inner frame 11 and a part of the outer frame 71 are sandwiched between the two.

  In a space under the floor (a space surrounded by the base material 94) located below the opening 92, for example, a storage (storage container) 96 as shown in FIG. When such a storage 96 is provided, the opening 92 can be used as an inspection port, and the space can also be used for storage purposes. Moreover, it can also be used for uses, such as a storage use, without using the opening part 92 as an inspection port. The storage 96 is supported by a flange portion 96 a (FIG. 2) provided along the periphery of the opening being placed on the upper surface of the outer frame support 95 through the outer frame 71.

  As shown in FIG. 2, the cover plate 81 has a two-layer structure in which two plate-like members 81a and 81b are laminated. On the upper surface of the cover plate 81, a handle 84 is provided that is gripped by the user when the cover plate 81 is attached and detached (see FIG. 1A).

  The inner frame 11 includes four corner members 21 attached to the corner portions 82 of the cover plate 81 and four frame members attached to the linear edge portions 83 of the cover plate 81 located between the adjacent corner portions 82. 41. Both end portions of each frame member 41 are connected to the corner member 21. In the present embodiment, the corner portion 82 refers to a region including a corner (ridge line extending vertically) of the cover plate 81 and side surfaces, an upper surface, and a lower surface in the vicinity thereof.

  Since the four corner members 21 have substantially the same shape, and the four frame members 41 have substantially the same shape, in the following, one of these corner members 21 and 2 connected to the corner member 21 will be described. One frame member 41 (41A, 41B) will be described as an example.

  3A to 3C and FIGS. 4A to 4C, the direction D1 indicates the longitudinal direction of one frame member 41A, and the direction D2 indicates the longitudinal direction of the other frame member 41B. Is shown. The direction W1 indicates the width direction of the one frame member 41A, and is orthogonal to the direction D1 and parallel to the horizontal direction. A direction W2 indicates the width direction of the other frame member 41B, and is orthogonal to the direction D2 and parallel to the horizontal direction. In the present embodiment, since the cover plate 81 is rectangular, the direction D1 and the direction W2 are the same direction, and the direction D2 and the direction W1 are the same direction.

  As shown in FIGS. 3A to 3C, 4A to 4C, and FIGS. 5A to 5C, the corner member 21 includes a corner side portion 22, a corner lower portion 23, And an upper corner 24. The corner side portion 22 covers the side surface of the corner portion 82 of the cover plate 81 in an L shape. The corner side portion 22 has a shape bent in an L shape in plan view. The corner side portion 22 has a shape in which a flat plate portion 22A substantially parallel to the direction D1 and a flat plate portion 22B substantially parallel to the direction D2 are connected at a ridge line 21a extending in the vertical direction. Hereinafter, the flat plate portion 22A is referred to as a corner side portion 22A, and the flat plate portion 22B is referred to as a corner side portion 22B.

  The corner lower portion 23 is connected to the lower end of the corner side portion 22 and extends in a flange shape so as to cover the lower surface of the corner portion 82. The corner lower portion 23 is connected to the lower end of the corner side portion 22 and extends in the width directions W1 and W2, and further extends in the width directions W1 and W2 from the base end region 23A and is smaller in thickness than the base end region 23A. And a tip region 23B. The lower surface of the distal end region 23B is located above the lower surface of the proximal end region 23A. On the lower surface of the base end region 23A, a packing groove 23C is formed so as to face the outer frame 71 and extend along the directions D1 and D2. A packing P is disposed between the packing groove 23C and the outer frame 71.

  As shown in FIGS. 5B and 5C, the corner upper portion 24 is connected to the upper end of the corner side portion 22 and extends in a flange shape so as to cover the upper surface of the corner portion 82. The upper surface of the corner upper portion 24 is a curved surface in which the outer region in the width direction W1 and the outer region in the width direction W2 are substantially flat, and the inner region in the width direction W1 and the inner region in the width direction W2 are curved downward.

  As shown in FIGS. 3B and 4B, the end surface 221 in the direction D1 of the corner side portion 22A, the end surface 231 in the direction D1 of the corner lower portion 23, and the end surface (step surface) 273 in the direction D1 of the corner upper portion 24. Are located on the same plane orthogonal to the direction D1, and are designed to abut or approach an end face of the frame member 41 described later in the direction D1. Similarly, the end surface 222 in the direction D2 of the corner side portion 22B, the end surface 232 in the direction D2 of the corner lower portion 23, and the stepped surface 273 in the direction D2 of the corner upper portion 24 are located on the same plane orthogonal to the direction D2. The frame member 41 is designed to come into contact with or be close to an end surface in the direction D2 of the frame member 41 described later.

  The corner member 21 has a pair of first protrusions 25 (25A, 25B), a pair of second protrusions 26 (26A, 26B), and a pair of third protrusions 27 (27A, 27B). Yes.

  One first protrusion 25A protrudes further in the direction D1 from the end surface 221 in the direction D1 of the corner side part 22A. The first protrusion 25A is located on the inner side (the cover plate 81 side) of the inner side surface 223 of the corner side portion 22A and the inner side surface 421 of the frame side portion 42, and extends along the inner side surface 421 of the frame side portion 42. The frame member 41 protrudes in the longitudinal direction (direction D1).

  The other first protruding portion 25B protrudes further in the direction D2 from the end surface 222 in the direction D2 of the corner side portion 22B. The first projecting portion 25 is located on the inner side (cover plate 81 side) of the inner side surface 223 of the corner side portion 22B and the inner side surface 421 of the frame side portion 42, and extends along the inner side surface 421 of the frame side portion 42. The frame member 41 protrudes in the longitudinal direction (direction D2).

  Each first protrusion 25 has a flat shape with a dimension in the thickness direction smaller than the dimension in the vertical direction. The thickness of each first protrusion 25 is gradually reduced from the upper end toward the lower end. That is, each first protrusion 25 has a wedge shape. The inner surface of the first protrusion 25 is substantially parallel to the vertical direction, and the outer surface of the first protrusion 25 is inclined with respect to the vertical direction. As will be described later, since the region between the extending portion 45 and the frame side portion 42 of the frame member 41 also has a similar wedge shape, the first protruding portion 25 inserted in the region has the vertical direction, In particular, it can be controlled to move downward. Moreover, since the 1st protrusion part 25 is a flat shape, the contact area of the thickness direction with the inner surface 421 can be enlarged, and stability improves.

  Since the corner of the tip of each first protrusion 25 has a rounded C shape, it can be easily inserted into the region. Each first projecting portion 25 is provided adjacent to the lower surface of the corner upper portion 24, and is in a position biased upward in the vertical direction of the corner member 21.

  One second protruding portion 26 </ b> A protrudes in the direction D <b> 1 along the upper surface of the frame lower portion 43 from the corner lower portion 23. The second protrusion 26A is located on the inner side (the cover plate 81 side) in the width direction W1 than the first protrusion 25A. The other second protrusion 26 </ b> B protrudes in the direction D <b> 2 along the upper surface of the frame lower portion 43 from the corner lower portion 23. The second protrusion 26B is located on the inner side (the cover plate 81 side) in the width direction W2 than the first protrusion 25B.

  The dimension in the width direction of each second protrusion 26 is designed to be approximately the same as or slightly smaller than the width of a groove 46 described later, and is constant over the entire area in the direction D1 or direction D2. Smaller than dimension in direction. As shown in FIGS. 5A to 5C, the protruding length of each second protruding portion 26 is smaller than the protruding length of each first protruding portion 25. The corners of the tips of the second protrusions 26 are rounded and rounded.

  Each third protrusion 27 protrudes in the longitudinal direction (direction D1 or direction D2) of the frame member 41 along the upper surface 441 of the frame upper portion 44 from the corner upper portion 24 and covers a part of the upper surface 441 of the frame upper portion 44. . The upper surface of each third protrusion 27 is continuously connected to the upper surface of the corner upper portion 24 without a step. The lower surface of each third protrusion 27 is connected to the lower surface of the corner upper portion 24 via a step surface 273 with which the end surface in the longitudinal direction of the frame upper portion 44 can come into contact. The lower surface of each third protrusion 27 is curved along the upper surface of the frame upper portion 44. Further, by providing the stepped surface 273, the thickness of the third protruding portion 27 can be made smaller than the thickness of the corner upper portion 24. Thereby, since the level | step difference of the 3rd protrusion part 27 and the frame upper part 44 can be made small, safety | security improves further.

  Each frame member 41 (41 </ b> A, 41 </ b> B) has a frame side part 42, a frame lower part 43, a frame upper part 44, an extending part 45, and a groove part 46. As shown in FIG. 6, each frame member 41 has a C-shaped cross-sectional shape.

  The frame side portion 42 extends along the side surface of the edge portion 83 and covers the side surface of the edge portion 83. The frame side portion 42 is slightly inclined with respect to the vertical direction, and the lower end portion of the frame member 41 is located on the inner side (the cover plate 81 side) in the width directions W1 and W2 than the upper end portion. As a result, the shape of the inner frame 11 tapers as it goes downward, so that the cover plate 81 with the inner frame 11 attached can be easily inserted into the opening surrounded by the outer frame 71.

  The extended portion 45 is connected to the lower surface 442 of the frame upper portion 44 and extends downward, and is connected to the vicinity of the center in the vertical direction of the inner side surface 421 of the frame side portion 42 and extends in the thickness direction. And a second extending piece 48 having an L-shaped cross section that extends upward. The lower end of the first extending piece 47 and the upper end of the second extending piece 48 are spaced apart by a predetermined distance. The lower end of the first extending piece 47 and the second extending piece 48 also serve as ribs and contribute to improving the rigidity.

  The first extending piece 47 has an opposing surface 451 that faces the inner side surface 421 and the frame side portion 42 in the thickness direction (width direction W1 or W2). The second extending piece 48 has a facing surface 452 that faces the inner side surface 421 and the frame side portion 42 in the thickness direction. The extending portion 45 restricts the vertical movement and the thickness movement of the first protrusion 25 sandwiched between the opposing surfaces 451 and 452 and the inner side surface 421 of the frame side portion 42. As shown in FIG. 6, a region (a wedge-shaped space extending in the vertical direction) between the opposed surfaces 451 and 452 of the extending portion 45 sandwiching the first projecting portion 25 and the inner side surface 421 of the frame side portion 42 is The frame member 41 is at a position biased upward from the center in the vertical direction.

  The frame side portion 42 has a rib R <b> 1 below the second extending piece 48. The rib R <b> 1 extends along the longitudinal direction of the frame member 41. As shown in FIG. 2, the side surface of the cover plate 81 abuts on the first extending piece 47, the second extending piece 48, and the rib R1.

  The frame lower portion 43 is connected to the lower end of the frame side portion 42 and extends in a flange shape so as to cover the lower surface of the edge portion 83. The frame lower portion 43 is connected to the lower end of the frame side portion 42 and covers a base end region 49 that covers a part of the lower surface of the edge 83, and is connected to the base end region 49 and further covers the lower surface of the edge 83 in the width direction W1. Or it has the front-end | tip area | region 50 extended inside W2. The distal end region 50 is thinner than the proximal end region 49. The proximal end region 49 is provided with a groove 46 and has a first contact surface 491 with which the lower surface 811 of the lid plate 81 contacts at positions on both sides in the width direction of the groove 46.

  The groove portion 46 is provided in the frame lower portion 43, and rises upward from both sides of the bottom surface 461 on which the lower surface of the second protrusion portion 26 is placed, and on both sides of the second protrusion portion 26. A pair of upstanding surfaces 462 facing each other. The depth of the groove 46 is designed to be approximately the same as or slightly larger than the height of the second protrusion 26, and the width of the groove 46 is approximately the same as or slightly the width of the second protrusion 26. It is designed to be large.

  The groove portion 46 regulates the movement in the width direction (direction W1 or W2) orthogonal to the longitudinal direction (direction D1 or D2) of the second protrusion 26 placed on the bottom surface 461, and between the bottom surface 461 and the lid plate 81. The vertical movement of the second projecting portion 26 sandwiched between the lower surface 811 (FIG. 2) and the lid plate 81 is restricted.

  The distal end region 50 has a second contact surface 501 that is at the same height as the first contact surface 491 of the proximal end region 49. The lower surface 811 of the cover plate 81 contacts the second contact surface 501. The tip region 50 is provided with a screw insertion portion 50a for inserting a screw 93 for fixing the lid plate 81 and the frame member 41 from below (FIG. 2). The screw insertion portion 50a may be, for example, a through hole provided in advance for inserting the screw 93 into the tip region 50, but is not a through hole but a mark indicating a portion into which the screw 93 is to be inserted. Also good. Examples of the mark include a dent and a notch formed at a corresponding portion of the tip region 50.

  The lower surface of the distal end region 50 is located above the lower surface of the proximal end region 49. Therefore, a space in which the head of the screw 93 is arranged is formed immediately below the lower surface of the tip region 50, and this space can be used effectively.

  On the upper surface of the tip region 50, a packing groove 51 is formed which is recessed below the second contact surface 501 and extends along the longitudinal direction (direction D1 or D2). On the lower surface of the base end region 49, a pair of contact surfaces 493 that contact the outer frame 71, and a packing groove 52 that is recessed above the contact surfaces 493 and extends along the longitudinal direction are formed. . A packing P is disposed between the packing groove 52 and the outer frame 71. The packing groove 51 and the packing groove 52 can be omitted. In this case, each packing P is joined to a flat surface where no groove is formed. Each packing P may be retrofitted to the frame member 41 by an adhesive means such as an adhesive, or may be integrally formed with the frame member 41 when the frame member 41 is formed. As each packing P, for example, a soft synthetic resin, a synthetic rubber, or the like can be used. Specifically, a foamed resin, a foamed rubber, or the like can be exemplified.

  In the base end region 49, a groove is formed outside the groove 46 in the width direction (W1 or W2), and a rib R2 is provided between them. The rib R <b> 2 extends along the longitudinal direction of the frame member 41. One of the first contact surfaces 491 described above is the upper surface of the rib R2.

  The frame upper part 44 is connected to the upper end of the frame side part 42 and extends in a flange shape so as to cover the upper surface of the edge part 83. The upper surface of the frame upper portion 44 is a curved surface in which the outer region in the width direction W1 (or W2) is substantially flat and the inner region in the width direction W1 (or W2) is curved downward.

  The corner member 21 can be formed, for example, by injection molding synthetic resin or the like. The frame member 41 can be formed by extruding, for example, synthetic resin. In addition, as a material of the corner member 21 and the frame member 41, metals, such as aluminum, can also be used.

  Next, the outer frame 71 will be described. As shown in FIGS. 1A, 2, 7 </ b> A to 7 </ b> C, and FIG. 8, four corner members 72 that are attached to the corners of the periphery of the opening 92 of the flooring 91. And four frame members 73 mounted on linear edges located between adjacent corners. Both end portions of each frame member 73 are connected to the corner member 72.

  Each corner member 72 has a corner side portion 721, a corner lower portion 722, and a corner upper portion 723. The corner side portion 721 covers the side surface of the corner portion of the opening 92 in an L shape. The corner side portion 721 has a shape bent in an L shape in plan view. The corner lower part 722 extends in a flange shape so as to support the corner lower part 23 of the inner frame 11 from the lower end of the corner side part 721. The corner upper part 723 extends in a flange shape so as to cover the upper surface of the flooring 91 at the corner of the opening 92.

  The corner member 72 has a pair of protrusions 74A and 74B. One protruding portion 74A further protrudes in the direction D1 from the end surface of the corner lower portion 722 in the direction D1. The other protrusion 74B protrudes further in the direction D2 from the end surface of the corner lower portion 722 in the direction D2. Since the corner of the tip of each protrusion has an R shape that is chamfered, it is easily inserted into a fitting hole of a frame member 73 described later.

  Each frame member 73 has a frame side portion 731, a frame lower portion 732, and a frame upper portion 733. The frame side portion 731 extends along the side surface of the edge portion of the opening 92 and covers the side surface of the edge portion. The frame lower portion 732 extends in a flange shape so as to support the frame lower portion 43 of the inner frame 11 from the lower end of the frame side portion 731. The frame lower portion 732 is connected to the lower end of the frame side portion 731, and a pedestal region 734 that supports the inner frame 11, and further extends from the pedestal region 734 in the width direction W 1 (or W 2) and has a smaller tip than the pedestal region 734. A region 735.

  The distal end region 735 is provided with a screw insertion portion as described above for inserting a screw 93 for fixing the outer frame 71 and the outer frame support 95 from above. A packing groove 736 extending along the longitudinal direction (direction D1 or D2) is formed on the lower surface of the tip region 735. The outer frame 71 is fixed to the outer frame support 95 with screws 93 in a state where the packing P is disposed in the packing groove 736.

  The corner member 72 can be formed, for example, by injection molding synthetic resin or the like. The frame member 73 can be formed by extruding, for example, synthetic resin. In addition, as a material of the corner member 72 and the frame member 73, metals, such as aluminum, can also be used.

  As described above, in the above-described embodiment, in the side portion of the inner frame, the extending portion having an opposing surface facing the inner surface of the frame side portion is provided, so that the first protruding portion extends from the frame side portion. The form that is held by the installation part is adopted. Thereby, the movement of the first protrusion is restricted in the width direction. On the other hand, at the lower part of the inner frame, a groove part is provided at the lower part of the frame, and the second projecting part placed on the bottom surface of the groove part is sandwiched between the bottom surface and the lower surface of the cover plate. When the corner member and the frame member are mounted on the lid plate, the lower portion of the frame and the second projecting portion are located directly below the lid plate, so that the weight of the lid plate is always applied to the lower portion of the frame and the second projecting portion. become. Thereby, the movement of the 2nd protrusion part to an up-down direction is effectively controlled by a cover plate and a groove part.

  Further, since the movement of the second projecting portion is regulated using the groove portion and the cover plate at the lower portion, it is only necessary to provide the groove portion having a depth similar to the thickness of the second projecting portion at the lower portion of the frame. It is possible to suppress an increase in the vertical dimension (thickness) of the lower part of the frame. Thereby, the material cost concerning a frame member can be reduced. In addition, since the increase in the thickness of the lower part of the frame is suppressed, the area below the lower surface of the cover plate, that is, the underfloor space can be effectively used.

  Moreover, in the said embodiment, since the 2nd protrusion part mounted in the bottom face of a groove part is also controlled by the pair of standing surfaces of a groove part in the width direction, the connection state of a corner member and a frame member is more stable. To do.

  Moreover, in the said embodiment, since the 3rd protrusion part of a corner member covers a part of upper surface of the frame upper part of a frame member, there exists dispersion | variation in a dimension of a corner member and a frame member, and between a corner member and a frame member. Even when a slight gap is generated, the gap is covered by the third protrusion. Therefore, it is possible to avoid exposing the gap as described above to the upper part of the inner frame. Further, the provision of the step surface facilitates the positioning of the corner member and the frame member.

  Moreover, in the said embodiment, the said area | region which accommodates a 1st protrusion part exists in the position biased upwards rather than the center of the up-down direction in a frame member. Therefore, a structure in which the corner member and the frame member are engaged at a lower position where the groove portion for accommodating the second projecting portion is present and an upper position where the region is present, in other words, at a position close to both ends of the inner frame in the vertical direction. Therefore, the stability of the engaged state is increased.

  Moreover, in the said embodiment, the base end area | region is located between a front-end | tip area | region and the lower end of a frame side part. That is, the screw insertion portion provided in the distal end region and the lower end of the frame side portion are positioned on both sides in the width direction of the groove portion provided in the proximal end region. Therefore, in a state where the frame member is fixed to the lid plate by the screw member, the groove portion and the second projecting portion placed in the groove portion are pressed (upward) from both sides in the width direction to the lower surface side of the lid plate. be able to. Thereby, since the movement of the 2nd projection part can be controlled more effectively, the connection state of a corner member and a frame member is further stabilized. Moreover, when fixing a frame member with a screw member in this way, a corner member does not need to be screwed.

  Moreover, in the said embodiment, the airtightness between a cover plate and a frame member can be improved by arrange | positioning packing to the groove part for packing, and fixing a frame member to a cover plate with the said screw member. Moreover, since the groove part for packing is located between a pair of contact surfaces, it can suppress that a packing shifts in the said width direction. Further, since the screw insertion portion is provided in the region where the packing groove is formed, the frame member is fixed to the cover plate in a state where the screw member penetrates the packing. Thereby, position shift of packing can be controlled more effectively.

  Moreover, in the said embodiment, the airtightness between an inner frame and an outer frame can be improved by arrange | positioning packing in the groove part for packing. Moreover, since the groove part for packing is located between a pair of opposing surfaces, it can suppress that packing displaces in the said width direction.

  Moreover, in the said embodiment, since the shape of a 1st protrusion part and the said area | region in which this is inserted is a wedge shape as mentioned above, the motion of the 1st protrusion part to the downward direction can be controlled. In addition, the wedge shape facilitates insertion into the region.

  In addition, since the design and material of the lid that covers the floor and its opening are often different for each property, it is usually not shipped with the inner frame pre-installed on the lid plate, but the inner frame is used on site. It is assembled to the lid plate. Therefore, it is preferable that the corner member and the frame member constituting the inner frame have a structure that can be easily assembled on site. When the inner frame is attached to the lid plate, for example, an operation of sequentially connecting each corner member and the corresponding frame member is performed.

  In this operation, in the above-described embodiment, the first protrusion of the corner member is disposed between the inner surface of the frame side portion and the opposing surface of the extending portion, and the second protrusion is disposed in the groove almost simultaneously with this. . At this time, the first protrusion needs to be inserted into the gap between the inner surface and the facing surface, while the second protrusion only needs to be placed on the bottom surface of the groove. The worker can connect the corner member and the frame member mainly while being conscious of the arrangement of the first protrusions. Therefore, the inner frame of the embodiment has a structure that is easy to assemble.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, in the said embodiment, although the case where the opening part of a flooring and a cover board were rectangular shapes was illustrated, it is not limited to this, Other polygons may be sufficient.

  Moreover, in the said embodiment, although the case where an extending part consists of a 1st extending piece and a 2nd extending piece as mentioned above was illustrated, it is not limited to this. The lower end of the first extending piece 47 and the upper end of the second extending piece 48 may be in contact with each other or close to each other, and the first extending piece 47 and the second extending piece 48 are separated. The form which is not closed, ie, the area | region where the 1st protrusion part 25 is inserted may be closed in the width direction.

  Moreover, in the said embodiment, although the 3rd protrusion part mentioned and demonstrated as an example the structure which covers a part of upper surface of a frame member, it is not limited to this. The structure where the edge part of a corner upper part and the edge part of a frame upper part are faced | matched may be sufficient. Moreover, the level | step difference surface provided between the 3rd protrusion part and the corner upper part is not necessarily essential.

  Further, in the above embodiment, the case where the lower part of the frame is composed of the base end region and the tip end region having a smaller thickness is exemplified, but the present invention is not limited to this, and these may be at positions opposite in the width direction. These thicknesses may be similar. Further, the screw insertion portion may be provided in the proximal end region, and the groove portion may be provided in the distal end region.

DESCRIPTION OF SYMBOLS 11 Floor opening structure inner frame 21 Corner member 22 Corner side part 23 Corner lower part 24 Corner upper part 25 1st protrusion part 26 2nd protrusion part 27 3rd protrusion part 41 Frame member 42 Frame side part 421 Inner side surface 43 of a frame side part Lower frame 44 Upper frame 45 Extension portion 451 Opposing surface 46 Groove portion 461 Bottom surface of groove portion 462, 463 Standing surface of groove portion 49 Base end region 50 Tip region 50a Screw insertion portion 71 Outer frame 81 Cover plate 82 Corner portion 83 Edge portion

Claims (6)

An inner frame for a floor opening structure having a shape that fits to an outer frame that is mounted along the periphery of a floor opening, and that is mounted along the periphery of a polygonal lid that closes the opening. And
A plurality of corner members mounted on corner portions of the lid plate, and a plurality of frame members mounted on edge portions of the lid plate located between adjacent corner portions and coupled to the corner members,
Each corner member includes a corner side portion covering the side surface of the corner portion, a corner lower portion connecting to the lower end of the corner side portion and covering a lower surface of the corner portion, and an upper surface of the corner portion connecting to the upper end of the corner side portion. An upper corner that covers,
Each frame member includes a frame side portion covering the side surface of the edge portion, a frame lower portion connecting to the lower end of the frame side portion and covering the lower surface of the edge portion, and an upper surface of the edge portion connected to the upper end of the frame side portion. An upper part of the frame to cover,
Each corner member includes a first projecting portion projecting in the longitudinal direction of the frame member along the inner side surface of the frame side portion from the corner side portion, and the longitudinal direction along the upper surface of the frame lower portion from the corner lower portion. A second projecting portion projecting into
Each frame member is connected to at least one of the frame side portion, the frame lower portion, and the frame upper portion, and has a facing surface facing the inner side surface of the frame side portion, and between the facing surface and the inner side surface, An extending portion sandwiching the first projecting portion; and a groove portion provided on the upper surface of the lower portion of the frame, extending in the longitudinal direction, and having a bottom surface on which the second projecting portion is placed,
The extending portion restricts the movement of the first projecting portion in the width direction orthogonal to the longitudinal direction of the frame member, and the groove member has the corner member and the frame member attached to the lid plate. An inner frame for a floor opening structure that restricts the movement of the second protrusion in the vertical direction with the second protrusion interposed between the bottom surface of the groove and the lower surface of the lid plate.   The groove portion further includes a pair of upstanding surfaces that rise upward from both sides of the bottom surface, and the second protruding portion in the width direction is sandwiched between the rising surfaces. The inner frame for a floor opening structure according to claim 1, which regulates movement. Each corner member further includes a third protrusion that protrudes in the longitudinal direction along the upper surface of the upper portion of the frame from the upper portion of the corner, and covers a part of the upper surface of the upper portion of the frame,
3. The floor opening structure according to claim 1, wherein a lower surface of the third projecting portion is connected to a lower surface of the upper corner portion through a step surface on which the end surface in the longitudinal direction of the upper portion of the frame can contact. Inner frame. The lower part of the frame has a proximal end region connected to the lower end of the frame side portion and extending in the width direction, and a distal end region extending further in the width direction from the proximal end region and having a smaller thickness than the proximal end region. ,
The groove portion is provided in the proximal end region,
The distal end region is provided with a screw insertion portion for inserting a screw member for fixing the lid plate and the frame member from below, and the lower surface of the distal end region is lower than the lower surface of the proximal end region. The inner frame for a floor opening structure according to any one of claims 1 to 3, which is located above. On the top surface of the tip region,
A pair of contact surfaces that are in contact with the lower surface of the lid plate, extend in the longitudinal direction, and are spaced apart from each other;
Between these contact surfaces, a groove for packing is formed that is recessed below the contact surface and extends along the longitudinal direction.
The said screw insertion part is an inner frame for floor opening structures of Claim 4 provided in the area | region in which the said groove part for packing was formed in the said front-end | tip area | region. The first protrusion has a flat shape in which the dimension in the width direction is smaller than the dimension in the vertical direction, and has a wedge shape in which the dimension in the width direction gradually decreases or gradually increases from the upper end toward the lower end. Have
The floor | bed in any one of Claims 1-5 which has the wedge shape in alignment with the shape of a said 1st protrusion part in the area | region between the said opposing surface and the said inner surface which pinches | interposes a said 1st protrusion part. Inner frame for opening structure.

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